Simplify rate limiting since it's main thread shared context only

cc/trees/layer_tree_host_client.h

Index: cc/trees/layer_tree_host_client.h
diff --git a/cc/trees/layer_tree_host_client.h b/cc/trees/layer_tree_host_client.h
index bde12dadc7da78c2c0e3b750651272deedb12c59..14ec3b9be7a84b99f65ea36b672d87c28534ef53 100644
--- a/cc/trees/layer_tree_host_client.h
+++ b/cc/trees/layer_tree_host_client.h
@@ -44,6 +44,9 @@ class LayerTreeHostClient {
   // the same thread as the OutputSurface's context.
   virtual scoped_refptr<cc::ContextProvider> OffscreenContextProvider() = 0;
 
+  // Blah blah blah bullshit

[jamesr, 2013/11/02 00:31:32]

Hmm, guess I have to improve this comment a bit before landing. It's fairly
accurate as is, however.

[piman, 2013/11/02 01:07:37]

Lol.

+  virtual void RateLimitSharedMainThreadContext() {}
+
   // This hook is for testing.
   virtual void DidFailToInitializeOutputSurface() {}