cc: Do bitmap conversion for RasterBuffer in the worker thread.

cc/resources/image_copy_raster_worker_pool.cc

Index: cc/resources/image_copy_raster_worker_pool.cc
diff --git a/cc/resources/image_copy_raster_worker_pool.cc b/cc/resources/image_copy_raster_worker_pool.cc
index 8220f28dc5d1005ff8c4534aa9adf1adb87632bd..6f11ed2a9428a3d9c03710653c4832e83a53bde2 100644
--- a/cc/resources/image_copy_raster_worker_pool.cc
+++ b/cc/resources/image_copy_raster_worker_pool.cc
@@ -191,13 +191,12 @@ void ImageCopyRasterWorkerPool::ReleaseBufferForRaster(RasterTask* task) {
   std::swap(*it, raster_task_states_.back());
   raster_task_states_.pop_back();
 
-  bool content_has_changed =
-      resource_provider_->ReleaseImageRasterBuffer(resource->id());
+  resource_provider_->ReleaseImageRasterBuffer(resource->id());

[reveman, 2014/08/13 19:19:49]

Let's keep having this return true when contents might have changed.

[auygun, 2014/08/14 10:35:42]

Done.

 
   // |content_has_changed| can be false as result of task being canceled or
   // task implementation deciding not to modify bitmap (ie. analysis of raster
   // commands detected content as a solid color).
-  if (content_has_changed) {
+  if (task->content_has_changed()) {
     resource_provider_->CopyResource(resource->id(), task->resource()->id());
     has_performed_copy_since_last_flush_ = true;
   }