add DeviceInfo

This reverts commit 096895550b9d5430d7a001d491566decf4f9791b.

Change-Id: Ib2ed1e96d8f7f88302f5e27fe735687194553104
diff --git a/libs/hwui/Extensions.h b/libs/hwui/Extensions.h
index 6689b88..8ccfabd 100644
--- a/libs/hwui/Extensions.h
+++ b/libs/hwui/Extensions.h
@@ -19,6 +19,9 @@
 
 #include <cutils/compiler.h>
 
+#include <string>
+#include <unordered_set>
+
 namespace android {
 namespace uirenderer {
 
@@ -26,9 +29,9 @@
 // Classes
 ///////////////////////////////////////////////////////////////////////////////
 
-class ANDROID_API Extensions {
+class Extensions {
 public:
-    Extensions();
+    void load();
 
     inline bool hasNPot() const { return mHasNPot; }
     inline bool hasFramebufferFetch() const { return mHasFramebufferFetch; }