content: Rename raster threads to worker threads.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 52fc453483f65bc86f1f93f2c273c0937b244a52..a9874ad1cffa6b89756aa22702069b95de8edd9d 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -564,8 +564,8 @@ class CONTENT_EXPORT RenderThreadImpl
   // regardless of whether |compositor_thread_| is overriden.
   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
 
-  // Threads used by compositor for rasterization.
-  ScopedVector<base::SimpleThread> compositor_raster_threads_;
+  // Threads for running background tasks (e.g. rasterization).
+  ScopedVector<base::SimpleThread> worker_threads_;
 
   base::CancelableCallback<void(const IPC::Message&)> main_input_callback_;
   scoped_refptr<IPC::MessageFilter> input_event_filter_;
@@ -597,7 +597,7 @@ class CONTENT_EXPORT RenderThreadImpl
 
   scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter_;
 
-  scoped_ptr<cc::TaskGraphRunner> compositor_task_graph_runner_;
+  scoped_ptr<cc::TaskGraphRunner> task_graph_runner_;
 
   // Compositor settings.
   bool is_gpu_rasterization_enabled_;