Add a flag to allow renderer to use software compositor when GL compositor doesn't work.

cc/trees/layer_tree_host.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.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 374 matching lines @@
     hud_layer_->RemoveFromParent();
     hud_layer_ = NULL;
   }
 }
 
 void LayerTreeHost::CommitComplete() {
   client_->DidCommit();
 }
 
 scoped_ptr<OutputSurface> LayerTreeHost::CreateOutputSurface() {
-  return client_->CreateOutputSurface();
+  return client_->CreateOutputSurface(num_failed_recreate_attempts_ >= 4);
 }
 
 scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
     LayerTreeHostImplClient* client) {
   DCHECK(proxy_->IsImplThread());
   scoped_ptr<LayerTreeHostImpl> host_impl =
       LayerTreeHostImpl::Create(settings_,
                                 client,
                                 proxy_.get(),
                                 rendering_stats_instrumentation_.get());
@@ skipping 668 matching lines @@
   for (AnimationRegistrar::AnimationControllerMap::iterator iter = copy.begin();
        iter != copy.end();
        ++iter) {
     (*iter).second->Animate(monotonic_time);
     bool start_ready_animations = true;
     (*iter).second->UpdateState(start_ready_animations, NULL);
   }
 }
 
 }  // namespace cc