This is initial API support required for enabling SurfaceTexture backed zero-copy for Android

ui/gl/android/surface_texture.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GL_ANDROID_SURFACE_TEXTURE_H_
 #define UI_GL_ANDROID_SURFACE_TEXTURE_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "ui/gl/gl_export.h"
 
 struct ANativeWindow;
 
 namespace gfx {
 
 // This class serves as a bridge for native code to call java functions inside
 // android SurfaceTexture class.
 class GL_EXPORT SurfaceTexture
     : public base::RefCountedThreadSafe<SurfaceTexture>{
  public:
-  explicit SurfaceTexture(int texture_id);
+  SurfaceTexture(int texture_id, bool single_buffered = false);

[reveman, 2014/03/08 14:10:20]

s/single_buffered/single_buffer_mode/ to be consistent with Android API and I
prefer if it doesn't have a default value.

[sohanjg, 2014/03/08 14:20:15]

Done.

 
   // Set the listener callback, which will be invoked on the same thread that
   // is being called from here for registration.
   // Note: Since callbacks come in from Java objects that might outlive objects
   // being referenced from the callback, the only robust way here is to create
   // the callback from a weak pointer to your object.
   void SetFrameAvailableCallback(const base::Closure& callback);
 
   // Update the texture image to the most recent frame from the image stream.
   void UpdateTexImage();
 
+  // Releases the the texture content. This is needed in single buffered mode

[reveman, 2014/03/08 14:10:20]

s/the the/the/

[sohanjg, 2014/03/08 14:20:15]

Done.

+  // to allow the image content producer to take ownership of the image buffer

[reveman, 2014/03/08 14:10:20]

Comment should end with a period ".".

[sohanjg, 2014/03/08 14:20:15]

Done.

+  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]);
 
   // Set the default size of the image buffers.
   void SetDefaultBufferSize(int width, int height);
 
   // Attach the SurfaceTexture to the texture currently bound to
   // GL_TEXTURE_EXTERNAL_OES.
   void AttachToGLContext();
@@ skipping 19 matching lines @@
 
   // Java SurfaceTexture instance.
   base::android::ScopedJavaGlobalRef<jobject> j_surface_texture_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceTexture);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_ANDROID_SURFACE_TEXTURE_H_