cc: Use the correct internal format for glCopyTexImage2D calls.

android_webview/browser/aw_render_thread_context_provider.h

Index: android_webview/browser/aw_render_thread_context_provider.h
diff --git a/android_webview/browser/aw_render_thread_context_provider.h b/android_webview/browser/aw_render_thread_context_provider.h
index ef0fecf13542cce9d1b6b0e1573f2a3d0b29774f..e2e45fbdba9eb385f96d038eba27597f83cd5825 100644
--- a/android_webview/browser/aw_render_thread_context_provider.h
+++ b/android_webview/browser/aw_render_thread_context_provider.h
@@ -32,6 +32,10 @@ class AwRenderThreadContextProvider : public cc::ContextProvider {
       scoped_refptr<gl::GLSurface> surface,
       scoped_refptr<gpu::InProcessCommandBuffer::Service> service);
 
+  // Gives the GL internal format that should be used for calling CopyTexImage2D
+  // on the default framebuffer.
+  uint32_t GetCopyTextureInternalFormat();
+
  private:
   AwRenderThreadContextProvider(
       scoped_refptr<gl::GLSurface> surface,