This is initial API support required for enabling SurfaceTexture backed zero-copy for 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 62e375f796f45959e1ca0de2e37b7144c5e66ba3..4068f852b94b1d95dca791308cf083e0e199a5a8 100644
--- a/ui/gl/android/surface_texture.h
+++ b/ui/gl/android/surface_texture.h
@@ -21,7 +21,9 @@ namespace gfx {
 class GL_EXPORT SurfaceTexture
     : public base::RefCountedThreadSafe<SurfaceTexture>{
  public:
-  explicit SurfaceTexture(int texture_id);
+  static SurfaceTexture* Create(int texture_id);

[reveman, 2014/03/10 16:16:58]

this should return a scoped_refptr<SurfaceTexture>

+
+  static SurfaceTexture* CreateSingleBufferMode(int texture_id);

[reveman, 2014/03/10 16:16:58]

I think "CreateSingleBuffered" is better

 
   // Set the listener callback, which will be invoked on the same thread that
   // is being called from here for registration.
@@ -33,6 +35,11 @@ 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, and supported only in single
+  // buffered mode to allow the image content producer to take ownership
+  // of the image buffer.
+  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]);
@@ -57,8 +64,14 @@ class GL_EXPORT SurfaceTexture
     return j_surface_texture_;
   }
 
+  // static

[reveman, 2014/03/10 16:16:58]

nit: no need for "// static" comment

+  static bool IsSingleBufferModeSupported();
+
   static bool RegisterSurfaceTexture(JNIEnv* env);
 
+ protected:
+  SurfaceTexture(int texture_id, bool single_buffer_mode);

[reveman, 2014/03/10 16:16:58]

How about we make this private and take a jobject:
SurfaceTexture(jobject surface_texture)

the Create function would do something like this instead:

::Create(int texture_id) {
  JNIEnv* env = base::android::AttachCurrentThread();
  base::android::ScopedJavaGlobalRef<jobject> j_surface_texture(
      Java_SurfaceTexturePlatformWrapper_create(env, texture_id))
  return make_scoped_refptr(
      new SurfaceTexture(j_surface_texture.get());
}

and ::CreateSingleBuffer would do the same but use
Java_SurfaceTexturePlatformWrapper_createSingleBuffered instead

+
  private:
   friend class base::RefCountedThreadSafe<SurfaceTexture>;
   ~SurfaceTexture();