cc: Move worker threads to content.

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index f050a64e1a74dede9134fcfe075fd614dcd9841c..dcd4a1909d811a5ac4519125dc87bfcd55e43bbb 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -138,8 +138,8 @@ Compositor::Compositor(gfx::AcceleratedWidget widget,
   base::TimeTicks before_create = base::TimeTicks::Now();
   host_ = cc::LayerTreeHost::CreateSingleThreaded(
       this, this, context_factory_->GetSharedBitmapManager(),
-      context_factory_->GetGpuMemoryBufferManager(), settings, task_runner_,
-      nullptr);
+      context_factory_->GetGpuMemoryBufferManager(),
+      context_factory_->GetTaskGraphRunner(), settings, task_runner_, nullptr);

[danakj, 2015/03/20 17:15:36]

Do we never want to GatherPixelRefs here? can you leave a TODO or a comment
about this?

[reveman, 2015/03/20 17:56:29]

Done.

   UMA_HISTOGRAM_TIMES("GPU.CreateBrowserCompositor",
                       base::TimeTicks::Now() - before_create);
   host_->SetRootLayer(root_web_layer_);