content: Add an overridable task runner to ChildThreadImpl

content/renderer/in_process_renderer_thread.cc

Index: content/renderer/in_process_renderer_thread.cc
diff --git a/content/renderer/in_process_renderer_thread.cc b/content/renderer/in_process_renderer_thread.cc
index fa6b834b1761ee1b1a91c87d9c04683a4439d7a4..341fc02ec2e0eb744b029f630e07afe423d51bb9 100644
--- a/content/renderer/in_process_renderer_thread.cc
+++ b/content/renderer/in_process_renderer_thread.cc
@@ -7,6 +7,7 @@
 #include "content/renderer/render_process.h"
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_thread_impl.h"
+#include "content/renderer/scheduler/renderer_scheduler.h"
 
 namespace content {
 
@@ -20,7 +21,9 @@ InProcessRendererThread::~InProcessRendererThread() {
 
 void InProcessRendererThread::Init() {
   render_process_.reset(new RenderProcessImpl());
-  new RenderThreadImpl(channel_id_);
+  scoped_ptr<RendererScheduler> renderer_scheduler =
+      RendererScheduler::Create();
+  new RenderThreadImpl(channel_id_, renderer_scheduler.Pass());
 }
 
 void InProcessRendererThread::CleanUp() {