Move output surface fallback from cc to embedders

android_webview/browser/hardware_renderer.cc

Index: android_webview/browser/hardware_renderer.cc
diff --git a/android_webview/browser/hardware_renderer.cc b/android_webview/browser/hardware_renderer.cc
index 7c348b52bb82990c7b390ae15d4c9601f08e7b7b..3a6561c86ed79e5ed55ea31dc0fcd70794e77871 100644
--- a/android_webview/browser/hardware_renderer.cc
+++ b/android_webview/browser/hardware_renderer.cc
@@ -252,9 +252,7 @@ void HardwareRenderer::DrawGL(bool stencil_enabled,
   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());
@@ -264,6 +262,10 @@ void HardwareRenderer::RequestNewOutputSurface(bool fallback) {
   layer_tree_host_->SetOutputSurface(output_surface_holder.Pass());
 }
 
+void HardwareRenderer::DidFailToInitializeOutputSurface() {
+  RequestNewOutputSurface();
+}
+
 void HardwareRenderer::UnusedResourcesAreAvailable() {
   cc::ReturnedResourceArray returned_resources;
   resource_collection_->TakeUnusedResourcesForChildCompositor(