UI impl side painting default on

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 35bd5e3f4e6f931153c499fdd4310855ce83febd..7b6148a32cc2fbefd23b20d6b2efaa543d127c01 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -669,7 +669,9 @@ void RenderThreadImpl::Init() {
     // threads in GPU raster mode.
     if (is_threaded_gpu_rasterization_enabled_)
       num_raster_threads = 1;
-    cc::TileTaskWorkerPool::SetNumWorkerThreads(num_raster_threads);
+
+    if (!command_line.HasSwitch(switches::kSingleProcess))

[reveman, 2015/02/27 17:34:15]

We need to call SetNumWorkerThreads in the browser process prior to creating the
browser compositor. And I think it would be nice with a comment making it clear
that this is not needed in single process mode because we've already set it for
the browser compositor.

+      cc::TileTaskWorkerPool::SetNumWorkerThreads(num_raster_threads);
 
 #if defined(OS_ANDROID) || defined(OS_LINUX)
     if (!command_line.HasSwitch(