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..ad2e38c799ea20efeeddd6e43f2a2a0a82463005 100644
--- a/ui/gl/android/surface_texture.h
+++ b/ui/gl/android/surface_texture.h
@@ -21,7 +21,7 @@ namespace gfx {
 class GL_EXPORT SurfaceTexture
     : public base::RefCountedThreadSafe<SurfaceTexture>{
  public:
-  explicit SurfaceTexture(int texture_id);
+  SurfaceTexture(int texture_id, bool single_buffer_mode);
 
   // Set the listener callback, which will be invoked on the same thread that
   // is being called from here for registration.
@@ -33,6 +33,10 @@ 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 in single buffered mode
+  // to allow the image content producer to take ownership of the image buffer.

[bulach, 2014/03/10 12:32:31]

should we comment that this is only available since KitKat?

[reveman, 2014/03/10 13:33:05]

I don't think so. We can add a comment about this only being supported in single
buffer mode but we should not expose the idea of android versions unless the
client of this API can also use that to determine if single buffered mode is
supported.

+  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]);