Move output surface fallback from cc to embedders

android_webview/browser/hardware_renderer.cc

 // Copyright 2014 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.
 
 #include "android_webview/browser/hardware_renderer.h"
 
 #include "android_webview/browser/aw_gl_surface.h"
 #include "android_webview/browser/deferred_gpu_command_service.h"
 #include "android_webview/browser/parent_output_surface.h"
 #include "android_webview/browser/shared_renderer_state.h"
@@ skipping 234 matching lines @@
   gl_surface_->SetBackingFrameBufferObject(framebuffer_binding_ext);
   {
     base::AutoReset<bool> frame_resetter(&viewport_clip_valid_for_dcheck_,
                                          true);
     layer_tree_host_->SetNeedsRedrawRect(clip_);
     layer_tree_host_->Composite(gfx::FrameTime::Now());
   }
   gl_surface_->ResetBackingFrameBufferObject();
 }
 
-void HardwareRenderer::RequestNewOutputSurface(bool fallback) {
-  // Android webview does not support losing output surface.
-  DCHECK(!fallback);
+void HardwareRenderer::RequestNewOutputSurface() {
   scoped_refptr<cc::ContextProvider> context_provider =
       CreateContext(gl_surface_,
                     DeferredGpuCommandService::GetInstance());
   scoped_ptr<ParentOutputSurface> output_surface_holder(
       new ParentOutputSurface(context_provider));
   output_surface_ = output_surface_holder.get();
   layer_tree_host_->SetOutputSurface(output_surface_holder.Pass());
 }
 
+void HardwareRenderer::DidFailToInitializeOutputSurface() {
+  RequestNewOutputSurface();
+}
+
 void HardwareRenderer::UnusedResourcesAreAvailable() {
   cc::ReturnedResourceArray returned_resources;
   resource_collection_->TakeUnusedResourcesForChildCompositor(
       &returned_resources);
   shared_renderer_state_->InsertReturnedResourcesOnRT(returned_resources);
 }
 
 }  // namespace android_webview