cc: Check for completed raster tasks at interval.

cc/raster_worker_pool.cc

Index: cc/raster_worker_pool.cc
diff --git a/cc/raster_worker_pool.cc b/cc/raster_worker_pool.cc
index bc6e50e7084ad8c9e94ca42afe7b098b107a7f92..de2373e4172b0dc2ea65ac74bbe7b416b12d9f05 100644
--- a/cc/raster_worker_pool.cc
+++ b/cc/raster_worker_pool.cc
@@ -23,6 +23,7 @@ class RasterWorkerPoolTaskImpl : public internal::WorkerPoolTask {
 
   virtual void Run(RenderingStats* rendering_stats) OVERRIDE {
     task_.Run(picture_pile_.get(), rendering_stats);
+    base::subtle::NoBarrier_Store(&completed_, 1);

[brianderson, 2013/02/12 01:44:31]

I think we need a barrier before setting completed_. Otherwise, compiler/cpu
reordering can mark completed_ before we are are actually done.

[reveman, 2013/02/12 02:29:52]

yea, this should already be fixed in patch set 2.

   }
 
  private: