Enable texture readback support for Android

content/browser/renderer_host/image_transport_factory_android.h

Index: content/browser/renderer_host/image_transport_factory_android.h
diff --git a/content/browser/renderer_host/image_transport_factory_android.h b/content/browser/renderer_host/image_transport_factory_android.h
index 329d14858e9dd9919da203596aa77289275dd36b..34d9a584f381c0a3a97414e5fd8a8c4a4d3c7cd8 100644
--- a/content/browser/renderer_host/image_transport_factory_android.h
+++ b/content/browser/renderer_host/image_transport_factory_android.h
@@ -8,7 +8,12 @@
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/native_widget_types.h"
 
+namespace WebKit {
+  class WebGraphicsContext3D;
+}
+
 namespace content {
+class GLHelper;
 class WebGraphicsContext3DCommandBufferImpl;
 
 class ImageTransportFactoryAndroid {
@@ -23,9 +28,12 @@ class ImageTransportFactoryAndroid {
 
   uint32_t InsertSyncPoint();
 
-  WebGraphicsContext3DCommandBufferImpl* GetContext3D();
+  WebKit::WebGraphicsContext3D* GetContext3D();
+  GLHelper* GetGLHelper();
+
  private:
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context_;
+  scoped_ptr<GLHelper> gl_helper_;
 };
 
 }  // namespace content