cc: Use impl-side painting in LTH context lost tests.

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 2099 matching lines @@
           ? BeginFrameArgs::DefaultEstimatedParentDrawTime()
           : base::TimeDelta();
   client_->SetEstimatedParentDrawTime(parent_draw_time);
 
   int max_frames_pending = output_surface_->capabilities().max_frames_pending;
   if (max_frames_pending <= 0)
     max_frames_pending = OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
   client_->SetMaxSwapsPendingOnImplThread(max_frames_pending);
   client_->OnCanDrawStateChanged(CanDraw());
 
+  // There will not be anything to draw here, so set high res
+  // to avoid checkerboards, typically when we are recovering
+  // from lost context.
+  active_tree_->SetRequiresHighResToDraw();
+
   return true;
 }
 
 void LayerTreeHostImpl::CommitVSyncParameters(base::TimeTicks timebase,
                                               base::TimeDelta interval) {
   client_->CommitVSyncParameters(timebase, interval);
 }
 
 void LayerTreeHostImpl::DeferredInitialize() {
   DCHECK(output_surface_->capabilities().deferred_gl_initialization);
@@ skipping 1248 matching lines @@
 }
 
 void LayerTreeHostImpl::UnregisterPictureLayerImpl(PictureLayerImpl* layer) {
   std::vector<PictureLayerImpl*>::iterator it =
       std::find(picture_layers_.begin(), picture_layers_.end(), layer);
   DCHECK(it != picture_layers_.end());
   picture_layers_.erase(it);
 }
 
 }  // namespace cc