Move blink scheduler implementation into a component

content/test/fake_renderer_scheduler.cc

Index: content/test/fake_renderer_scheduler.cc
diff --git a/content/test/fake_renderer_scheduler.cc b/content/test/fake_renderer_scheduler.cc
index 07c85a5f1d52d953ecf6a2a2c8d312c3da816cc3..1424706f3854e0704080b7961a64d9dfb97b9395 100644
--- a/content/test/fake_renderer_scheduler.cc
+++ b/content/test/fake_renderer_scheduler.cc
@@ -27,7 +27,7 @@ FakeRendererScheduler::LoadingTaskRunner() {
   return nullptr;
 }
 
-scoped_refptr<SingleThreadIdleTaskRunner>
+scoped_refptr<scheduler::SingleThreadIdleTaskRunner>
 FakeRendererScheduler::IdleTaskRunner() {
   return nullptr;
 }