Merge "Revert "Revert "Add useVrFlinger() method to SurfaceFlinger ConfigStore"""
diff --git a/configstore/1.0/ISurfaceFlingerConfigs.hal b/configstore/1.0/ISurfaceFlingerConfigs.hal
index 43c96ee..c7fb78b 100644
--- a/configstore/1.0/ISurfaceFlingerConfigs.hal
+++ b/configstore/1.0/ISurfaceFlingerConfigs.hal
@@ -96,4 +96,12 @@
      * mechanism which significantly reduces buffer processing latency.
      */
     hasSyncFramework() generates(OptionalBool value);
+
+    /*
+     * Return true if surface flinger should use vr flinger for compatible vr
+     * apps, false otherwise. Devices that will never be running vr apps should
+     * return false to avoid extra resource usage. Daydream ready devices must
+     * return true for full vr support.
+     */
+    useVrFlinger() generates (OptionalBool value);
 };
diff --git a/configstore/1.0/default/SurfaceFlingerConfigs.cpp b/configstore/1.0/default/SurfaceFlingerConfigs.cpp
index e8872e8..fc66c59 100644
--- a/configstore/1.0/default/SurfaceFlingerConfigs.cpp
+++ b/configstore/1.0/default/SurfaceFlingerConfigs.cpp
@@ -111,6 +111,18 @@
   return Void();
 }
 
+Return<void> SurfaceFlingerConfigs::useVrFlinger(useVrFlinger_cb _hidl_cb) {
+    bool value = false;
+    bool specified = false;
+#ifdef USE_VR_FLINGER
+    value = true;
+    specified = true;
+#endif
+    _hidl_cb({specified, value});
+    LOG(INFO) << "SurfaceFlinger UseVrFlinger: " << (value ? "true" : "false");
+    return Void();
+}
+
 // Methods from ::android::hidl::base::V1_0::IBase follow.
 ISurfaceFlingerConfigs* HIDL_FETCH_ISurfaceFlingerConfigs(const char* /* name */) {
     return new SurfaceFlingerConfigs();
diff --git a/configstore/1.0/default/SurfaceFlingerConfigs.h b/configstore/1.0/default/SurfaceFlingerConfigs.h
index bea1ab1..b0aaaf8 100644
--- a/configstore/1.0/default/SurfaceFlingerConfigs.h
+++ b/configstore/1.0/default/SurfaceFlingerConfigs.h
@@ -34,6 +34,7 @@
     Return<void> useHwcForRGBtoYUV(useHwcForRGBtoYUV_cb _hidl_cb) override;
     Return<void> maxVirtualDisplaySize(maxVirtualDisplaySize_cb _hidl_cb) override;
     Return<void> hasSyncFramework(hasSyncFramework_cb _hidl_cb) override;
+    Return<void> useVrFlinger(useVrFlinger_cb _hidl_cb) override;
 
     // Methods from ::android::hidl::base::V1_0::IBase follow.
 
diff --git a/configstore/1.0/default/surfaceflinger.mk b/configstore/1.0/default/surfaceflinger.mk
index 6e63fdc..7837498 100644
--- a/configstore/1.0/default/surfaceflinger.mk
+++ b/configstore/1.0/default/surfaceflinger.mk
@@ -46,3 +46,7 @@
 ifeq ($(TARGET_RUNNING_WITHOUT_SYNC_FRAMEWORK),true)
     LOCAL_CFLAGS += -DRUNNING_WITHOUT_SYNC_FRAMEWORK
 endif
+
+ifneq ($(USE_VR_FLINGER),)
+    LOCAL_CFLAGS += -DUSE_VR_FLINGER
+endif