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

cc/resources/pixel_buffer_raster_worker_pool.cc

Index: cc/resources/pixel_buffer_raster_worker_pool.cc
diff --git a/cc/resources/pixel_buffer_raster_worker_pool.cc b/cc/resources/pixel_buffer_raster_worker_pool.cc
index d7554736942a66ee541c065c99320385c42d0234..f98779ccda77966f69fe3c19b6132deab8a8acec 100644
--- a/cc/resources/pixel_buffer_raster_worker_pool.cc
+++ b/cc/resources/pixel_buffer_raster_worker_pool.cc
@@ -261,7 +261,7 @@ void PixelBufferRasterWorkerPool::CheckForCompletedTasks() {
   completed_raster_tasks_.clear();
 }
 
-SkCanvas* PixelBufferRasterWorkerPool::AcquireCanvasForRaster(
+RasterBuffer* PixelBufferRasterWorkerPool::AcquireBufferForRaster(
     RasterTask* task) {
   DCHECK(std::find_if(raster_task_states_.begin(),
                       raster_task_states_.end(),
@@ -271,7 +271,7 @@ SkCanvas* PixelBufferRasterWorkerPool::AcquireCanvasForRaster(
   return resource_provider_->MapPixelRasterBuffer(task->resource()->id());
 }
 
-void PixelBufferRasterWorkerPool::ReleaseCanvasForRaster(RasterTask* task) {
+void PixelBufferRasterWorkerPool::ReleaseBufferForRaster(RasterTask* task) {
   DCHECK(std::find_if(raster_task_states_.begin(),
                       raster_task_states_.end(),
                       RasterTaskState::TaskComparator(task)) !=
@@ -683,7 +683,7 @@ void PixelBufferRasterWorkerPool::CheckForCompletedRasterizerTasks() {
     RasterTaskState& state = *state_it;
     DCHECK_EQ(RasterTaskState::SCHEDULED, state.type);
 
-    // Balanced with MapPixelRasterBuffer() call in AcquireCanvasForRaster().
+    // Balanced with MapPixelRasterBuffer() call in AcquireBufferForRaster().
     bool content_has_changed = resource_provider_->UnmapPixelRasterBuffer(
         raster_task->resource()->id());