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..aa3df22e6526c9416e384db2ebf6f56c68a8cfc0 100644
--- a/cc/raster_worker_pool.cc
+++ b/cc/raster_worker_pool.cc
@@ -14,7 +14,7 @@ class RasterWorkerPoolTaskImpl : public internal::WorkerPoolTask {
  public:
   RasterWorkerPoolTaskImpl(PicturePileImpl* picture_pile,
                            const RasterWorkerPool::RasterCallback& task,
-                           const base::Closure& reply)
+                           const base::Callback<void(bool)>& reply)
       : internal::WorkerPoolTask(reply),
         picture_pile_(picture_pile),
         task_(task) {
@@ -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::Release_Store(&completed_, 1);
   }
 
  private:
@@ -41,7 +42,7 @@ RasterWorkerPool::~RasterWorkerPool() {
 
 void RasterWorkerPool::PostRasterTaskAndReply(PicturePileImpl* picture_pile,
                                               const RasterCallback& task,
-                                              const base::Closure& reply) {
+                                              const Reply& reply) {
   Worker* worker = GetWorkerForNextTask();
 
   scoped_refptr<PicturePileImpl> picture_pile_clone =