diff --git a/core/java/android/view/HardwareRenderer.java b/core/java/android/view/HardwareRenderer.java
index e8c1653..8dada90 100644
--- a/core/java/android/view/HardwareRenderer.java
+++ b/core/java/android/view/HardwareRenderer.java
@@ -406,6 +406,17 @@
     private static native void nBeginFrame(int[] size);
 
     /**
+     * Returns the current system time according to the renderer.
+     * This method is used for debugging only and should not be used
+     * as a clock.
+     */
+    static long getSystemTime() {
+        return nGetSystemTime();
+    }
+
+    private static native long nGetSystemTime();
+
+    /**
      * Preserves the back buffer of the current surface after a buffer swap.
      * Calling this method sets the EGL_SWAP_BEHAVIOR attribute of the current
      * surface to EGL_BUFFER_PRESERVED. Calling this method requires an EGL
@@ -852,6 +863,8 @@
         private final int[] mSurfaceSize = new int[2];
         private final FunctorsRunnable mFunctorsRunnable = new FunctorsRunnable();
 
+        private long mDrawDelta = Long.MAX_VALUE;
+
         GlRenderer(int glVersion, boolean translucent) {
             mGlVersion = glVersion;
             mTranslucent = translucent;
@@ -1413,6 +1426,7 @@
                     int saveCount = 0;
                     int status = DisplayList.STATUS_DONE;
 
+                    long start = getSystemTime();
                     try {
                         status = prepareFrame(dirty);
 
@@ -1432,12 +1446,15 @@
                         canvas.restoreToCount(saveCount);
                         view.mRecreateDisplayList = false;
 
-                        debugOverdraw(attachInfo, dirty, canvas, displayList);
+                        mDrawDelta = getSystemTime() - start;
 
-                        mFrameCount++;
+                        if (mDrawDelta > 0) {
+                            mFrameCount++;
 
-                        debugDirtyRegions(dirty, canvas);
-                        drawProfileData(attachInfo);
+                            debugOverdraw(attachInfo, dirty, canvas, displayList);
+                            debugDirtyRegions(dirty, canvas);
+                            drawProfileData(attachInfo);
+                        }
                     }
 
                     onPostDraw();
@@ -1509,6 +1526,10 @@
         }
 
         private DisplayList buildDisplayList(View view, HardwareCanvas canvas) {
+            if (mDrawDelta <= 0) {
+                return view.mDisplayList;
+            }
+
             view.mRecreateDisplayList = (view.mPrivateFlags & View.PFLAG_INVALIDATED)
                     == View.PFLAG_INVALIDATED;
             view.mPrivateFlags &= ~View.PFLAG_INVALIDATED;
diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index fc005d1..8462c80 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -111,7 +111,7 @@
      * Set this system property to true to force the view hierarchy to render
      * at 60 Hz. This can be used to measure the potential framerate.
      */
-    private static final String PROPERTY_PROFILE_RENDERING = "viewancestor.profile_rendering";
+    private static final String PROPERTY_PROFILE_RENDERING = "viewroot.profile_rendering";
     private static final String PROPERTY_MEDIA_DISABLED = "config.disable_media";
 
     /**
diff --git a/core/jni/android_view_HardwareRenderer.cpp b/core/jni/android_view_HardwareRenderer.cpp
index 948a966..479fbe2 100644
--- a/core/jni/android_view_HardwareRenderer.cpp
+++ b/core/jni/android_view_HardwareRenderer.cpp
@@ -20,9 +20,14 @@
 #include <nativehelper/JNIHelp.h>
 #include <android_runtime/AndroidRuntime.h>
 
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
 #include <EGL/egl_cache.h>
 
+#include <utils/Timers.h>
+
 #include <Caches.h>
+#include <Extensions.h>
 
 #ifdef USE_OPENGL_RENDERER
     EGLAPI void EGLAPIENTRY eglBeginFrame(EGLDisplay dpy, EGLSurface surface);
@@ -119,6 +124,13 @@
     eglBeginFrame(display, surface);
 }
 
+static jlong android_view_HardwareRenderer_getSystemTime(JNIEnv* env, jobject clazz) {
+    if (uirenderer::Extensions::getInstance().hasNvSystemTime()) {
+        return eglGetSystemTimeNV();
+    }
+    return systemTime(SYSTEM_TIME_MONOTONIC);
+}
+
 #endif // USE_OPENGL_RENDERER
 
 // ----------------------------------------------------------------------------
@@ -146,6 +158,8 @@
     { "nLoadProperties",        "()Z",   (void*) android_view_HardwareRenderer_loadProperties },
 
     { "nBeginFrame",            "([I)V", (void*) android_view_HardwareRenderer_beginFrame },
+
+    { "nGetSystemTime",         "()J",   (void*) android_view_HardwareRenderer_getSystemTime },
 #endif
 
     { "nSetupShadersDiskCache", "(Ljava/lang/String;)V",
diff --git a/libs/hwui/Extensions.cpp b/libs/hwui/Extensions.cpp
index 51aec8d..eefdb84 100644
--- a/libs/hwui/Extensions.cpp
+++ b/libs/hwui/Extensions.cpp
@@ -14,6 +14,16 @@
  * limitations under the License.
  */
 
+#define LOG_TAG "OpenGLRenderer"
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <utils/Log.h>
+
 #include "Debug.h"
 #include "Extensions.h"
 
@@ -40,33 +50,22 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 Extensions::Extensions(): Singleton<Extensions>() {
-    const char* buffer = (const char*) glGetString(GL_EXTENSIONS);
-    const char* current = buffer;
-    const char* head = current;
-    EXT_LOGD("Available GL extensions:");
-    do {
-        head = strchr(current, ' ');
-        String8 s(current, head ? head - current : strlen(current));
-        if (s.length()) {
-            mExtensionList.add(s);
-            EXT_LOGD("  %s", s.string());
-        }
-        current = head + 1;
-    } while (head);
+    // Query GL extensions
+    findExtensions((const char*) glGetString(GL_EXTENSIONS), mGlExtensionList);
+    mHasNPot = hasGlExtension("GL_OES_texture_npot");
+    mHasFramebufferFetch = hasGlExtension("GL_NV_shader_framebuffer_fetch");
+    mHasDiscardFramebuffer = hasGlExtension("GL_EXT_discard_framebuffer");
+    mHasDebugMarker = hasGlExtension("GL_EXT_debug_marker");
+    mHasDebugLabel = hasGlExtension("GL_EXT_debug_label");
+    mHasTiledRendering = hasGlExtension("GL_QCOM_tiled_rendering");
+    mHas1BitStencil = hasGlExtension("GL_OES_stencil1");
+    mHas4BitStencil = hasGlExtension("GL_OES_stencil4");
 
-    mHasNPot = hasExtension("GL_OES_texture_npot");
-    mHasFramebufferFetch = hasExtension("GL_NV_shader_framebuffer_fetch");
-    mHasDiscardFramebuffer = hasExtension("GL_EXT_discard_framebuffer");
-    mHasDebugMarker = hasExtension("GL_EXT_debug_marker");
-    mHasDebugLabel = hasExtension("GL_EXT_debug_label");
-    mHasTiledRendering = hasExtension("GL_QCOM_tiled_rendering");
-    mHas1BitStencil = hasExtension("GL_OES_stencil1");
-    mHas4BitStencil = hasExtension("GL_OES_stencil4");
-
-    mExtensions = strdup(buffer);
+    // Query EGL extensions
+    findExtensions(eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS), mEglExtensionList);
+    mHasNvSystemTime = hasEglExtension("EGL_NV_system_time");
 
     const char* version = (const char*) glGetString(GL_VERSION);
-    mVersion = strdup(version);
 
     // Section 6.1.5 of the OpenGL ES specification indicates the GL version
     // string strictly follows this format:
@@ -88,22 +87,41 @@
 }
 
 Extensions::~Extensions() {
-   free(mExtensions);
-   free(mVersion);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // Methods
 ///////////////////////////////////////////////////////////////////////////////
 
-bool Extensions::hasExtension(const char* extension) const {
+bool Extensions::hasGlExtension(const char* extension) const {
    const String8 s(extension);
-   return mExtensionList.indexOf(s) >= 0;
+   return mGlExtensionList.indexOf(s) >= 0;
+}
+
+bool Extensions::hasEglExtension(const char* extension) const {
+   const String8 s(extension);
+   return mEglExtensionList.indexOf(s) >= 0;
+}
+
+void Extensions::findExtensions(const char* extensions, SortedVector<String8>& list) const {
+    const char* current = extensions;
+    const char* head = current;
+    EXT_LOGD("Available extensions:");
+    do {
+        head = strchr(current, ' ');
+        String8 s(current, head ? head - current : strlen(current));
+        if (s.length()) {
+            list.add(s);
+            EXT_LOGD("  %s", s.string());
+        }
+        current = head + 1;
+    } while (head);
 }
 
 void Extensions::dump() const {
-   ALOGD("%s", mVersion);
-   ALOGD("Supported extensions:\n%s", mExtensions);
+   ALOGD("%s", (const char*) glGetString(GL_VERSION));
+   ALOGD("Supported GL extensions:\n%s", (const char*) glGetString(GL_EXTENSIONS));
+   ALOGD("Supported EGL extensions:\n%s", eglQueryString(eglGetCurrentDisplay(), EGL_EXTENSIONS));
 }
 
 }; // namespace uirenderer
diff --git a/libs/hwui/Extensions.h b/libs/hwui/Extensions.h
index a3f7c44..3112244 100644
--- a/libs/hwui/Extensions.h
+++ b/libs/hwui/Extensions.h
@@ -17,13 +17,12 @@
 #ifndef ANDROID_HWUI_EXTENSIONS_H
 #define ANDROID_HWUI_EXTENSIONS_H
 
+#include <cutils/compiler.h>
+
 #include <utils/Singleton.h>
 #include <utils/SortedVector.h>
 #include <utils/String8.h>
 
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-
 namespace android {
 namespace uirenderer {
 
@@ -31,7 +30,7 @@
 // Classes
 ///////////////////////////////////////////////////////////////////////////////
 
-class Extensions: public Singleton<Extensions> {
+class ANDROID_API Extensions: public Singleton<Extensions> {
 public:
     inline bool hasNPot() const { return mHasNPot; }
     inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }
@@ -41,11 +40,13 @@
     inline bool hasTiledRendering() const { return mHasTiledRendering; }
     inline bool has1BitStencil() const { return mHas1BitStencil; }
     inline bool has4BitStencil() const { return mHas4BitStencil; }
+    inline bool hasNvSystemTime() const { return mHasNvSystemTime; }
 
     inline int getMajorGlVersion() const { return mVersionMajor; }
     inline int getMinorGlVersion() const { return mVersionMinor; }
 
-    bool hasExtension(const char* extension) const;
+    bool hasGlExtension(const char* extension) const;
+    bool hasEglExtension(const char* extension) const;
 
     void dump() const;
 
@@ -53,12 +54,12 @@
     Extensions();
     ~Extensions();
 
+    void findExtensions(const char* extensions, SortedVector<String8>& list) const;
+
     friend class Singleton<Extensions>;
 
-    SortedVector<String8> mExtensionList;
-
-    char* mExtensions;
-    char* mVersion;
+    SortedVector<String8> mGlExtensionList;
+    SortedVector<String8> mEglExtensionList;
 
     bool mHasNPot;
     bool mHasFramebufferFetch;
@@ -68,6 +69,7 @@
     bool mHasTiledRendering;
     bool mHas1BitStencil;
     bool mHas4BitStencil;
+    bool mHasNvSystemTime;
 
     int mVersionMajor;
     int mVersionMinor;