android webview: allow cc to fail hardware draw

android_webview/browser/parent_output_surface.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/parent_output_surface.h"
 
 #include "cc/output/output_surface_client.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 
 namespace android_webview {
 
 ParentOutputSurface::ParentOutputSurface(
     scoped_refptr<cc::ContextProvider> context_provider)
     : cc::OutputSurface(context_provider) {
-  capabilities_.draw_and_swap_full_viewport_every_frame = true;
 }
 
 ParentOutputSurface::~ParentOutputSurface() {
 }
 
 void ParentOutputSurface::Reshape(const gfx::Size& size, float scale_factor) {
   DCHECK_EQ(1.f, scale_factor);
   surface_size_ = size;
 }
 
 void ParentOutputSurface::SwapBuffers(cc::CompositorFrame* frame) {
   context_provider_->ContextGL()->ShallowFlushCHROMIUM();
   client_->DidSwapBuffers();
 }
 
 }  // namespace android_webview