cc: Clarify that color spaces are for raster

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 9a63601f1518184dd63558e00ee15bddb0943dc2..76d0a2ac9b8254cfd5fe382522880e43354be1f8 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -802,7 +802,7 @@ void TileManager::ScheduleTasks(
 
   graph_.Reset();
 
-  gfx::ColorSpace target_color_space = client_->GetTileColorSpace();
+  gfx::ColorSpace raster_color_space = client_->GetRasterColorSpace();
 
   scoped_refptr<TileTask> required_for_activation_done_task =
       CreateTaskSetFinishedTask(
@@ -823,7 +823,7 @@ void TileManager::ScheduleTasks(
 
     if (!tile->raster_task_) {
       tile->raster_task_ =
-          CreateRasterTask(prioritized_tile, target_color_space);
+          CreateRasterTask(prioritized_tile, raster_color_space);
     }
 
     TileTask* task = tile->raster_task_.get();