Enable texture readback support for Android

content/public/browser/android/compositor.h

Index: content/public/browser/android/compositor.h
diff --git a/content/public/browser/android/compositor.h b/content/public/browser/android/compositor.h
index 33da403e228e9e8d9f63b11be6b23d6e172a4c42..721b5fd6e854905bb87978cf27a5407635d28fed 100644
--- a/content/public/browser/android/compositor.h
+++ b/content/public/browser/android/compositor.h
@@ -73,6 +73,10 @@ class Compositor {
   // Deletes an OpenGL texture.
   virtual void DeleteTexture(WebKit::WebGLId texture_id) = 0;
 
+  // Grabs a copy of |texture_id| and saves it into |bitmap|.  No scaling is
+  // done.  It is assumed that the texture size matches that of the bitmap.
+  virtual void CopyTextureToBitmap(WebKit::WebGLId texture_id,
+                                   gfx::JavaBitmap& bitmap) = 0;
  protected:
   Compositor() {}
 };