ui: Use single buffer SurfaceTexture mode for native GpuMemoryBuffers on Android.

ui/gl/android/surface_texture.h

Index: ui/gl/android/surface_texture.h
diff --git a/ui/gl/android/surface_texture.h b/ui/gl/android/surface_texture.h
index c6ae70490120ccbaf35a807d8ad9a398aa5d4b4c..92b660949405278ac3fe2ab7c5c058a922c33713 100644
--- a/ui/gl/android/surface_texture.h
+++ b/ui/gl/android/surface_texture.h
@@ -22,6 +22,7 @@ class GL_EXPORT SurfaceTexture
     : public base::RefCountedThreadSafe<SurfaceTexture>{
  public:
   static scoped_refptr<SurfaceTexture> Create(int texture_id);
+  static scoped_refptr<SurfaceTexture> CreateSingleBuffered(int texture_id);
 
   // Set the listener callback, which will be invoked on the same thread that
   // is being called from here for registration.
@@ -33,6 +34,13 @@ class GL_EXPORT SurfaceTexture
   // Update the texture image to the most recent frame from the image stream.
   void UpdateTexImage();
 
+  // Release the texture content. This is needed only in single buffered mode
+  // to allow the image content producer to take ownership
+  // of the image buffer.
+  // This is *only* supported on SurfaceTexture instantiated via
+  // |CreateSingleBuffered(...)|.
+  void ReleaseTexImage();
+
   // Retrieve the 4x4 texture coordinate transform matrix associated with the
   // texture image set by the most recent call to updateTexImage.
   void GetTransformMatrix(float mtx[16]);
@@ -54,6 +62,10 @@ class GL_EXPORT SurfaceTexture
     return j_surface_texture_;
   }
 
+  // This should only be used to guard the SurfaceTexture instantiated via
+  // |CreateSingleBuffered(...)|
+  static bool IsSingleBufferModeSupported();
+
   static bool RegisterSurfaceTexture(JNIEnv* env);
 
  protected: