Add hints for potential overlay promotion on android.

cc/resources/resource_provider.h

Index: cc/resources/resource_provider.h
diff --git a/cc/resources/resource_provider.h b/cc/resources/resource_provider.h
index afabed7b8d8fcbc91c4278e70eab31e247cb7edb..a4579f9a8aaef66a131ddab4a0c8ab01ebefb267 100644
--- a/cc/resources/resource_provider.h
+++ b/cc/resources/resource_provider.h
@@ -478,6 +478,13 @@ class CC_EXPORT ResourceProvider
   // Indicates if this resource may be used for a hardware overlay plane.
   bool IsOverlayCandidate(ResourceId id);
 
+#if defined(OS_ANDROID)
+  // Indicates if this resource is backed by an Android SurfaceTexture, and thus
+  // can't really be promoted to an overlay.
+  // TODO(liberato): be sure that this is sent via IPC.
+  bool IsBackedBySurfaceTexture(ResourceId id);
+#endif
+
   void WaitSyncTokenIfNeeded(ResourceId id);
 
   static GLint GetActiveTextureUnit(gpu::gles2::GLES2Interface* gl);
@@ -581,6 +588,19 @@ class CC_EXPORT ResourceProvider
     bool read_lock_fences_enabled : 1;
     bool has_shared_bitmap_id : 1;
     bool is_overlay_candidate : 1;
+#if defined(OS_ANDROID)
+    // Indicates whether this resource may not be overlayed on Android, since
+    // it's
+    // not backed by a SurfaceView.  This may be set in combination with
+    // |is_overlay_candidate|, to find out if switching the resource to a
+    // a SurfaceView would result in overlay promotion.  It's good to find this
+    // out in advance, since one has no fallback path for displaying a
+    // SurfaceView except via promoting it to an overlay.  Ideally, one _could_
+    // promote SurfaceTexture via the overlay path, even if one ended up just
+    // drawing a quad in the compositor.  However, for now, we use this flag to
+    // refuse to promote so that the compositor will draw the quad.
+    bool is_backed_by_surface_texture : 1;
+#endif
     scoped_refptr<Fence> read_lock_fence;
     gfx::Size size;
     Origin origin;