LayerTreeHostImpl knows if it has an output surface.

cc/output/renderer.cc

 // Copyright 2012 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 "cc/output/renderer.h"
 
 namespace cc {
 
 bool Renderer::HasAllocatedResourcesForTesting(RenderPass::Id id) const {
   return false;
 }
 
-bool Renderer::IsContextLost() {
-  return false;
-}
-
 void Renderer::SetVisible(bool visible) {
   if (visible_ == visible)
     return;
 
   visible_ = visible;
   DidChangeVisibility();
 }
 
 RendererCapabilitiesImpl::RendererCapabilitiesImpl()
     : best_texture_format(RGBA_8888),
       allow_partial_texture_updates(false),
       max_texture_size(0),
       using_shared_memory_resources(false),
       using_partial_swap(false),
       using_egl_image(false),
       using_map_image(false),
       using_discard_framebuffer(false),
       allow_rasterize_on_demand(false) {}
 
 RendererCapabilitiesImpl::~RendererCapabilitiesImpl() {}
 
 RendererCapabilities RendererCapabilitiesImpl::MainThreadCapabilities() const {
   return RendererCapabilities(best_texture_format,
                               allow_partial_texture_updates,
                               max_texture_size,
                               using_shared_memory_resources);
 }
 
 }  // namespace cc