Added ability to dynamically toggle frame throttling in the scheduler.

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 816050bb04ca6c9d3f058fec687140ee2a7429d5..2fa54be3b9dbf02411b5febf655ba440e952716a 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -112,6 +112,14 @@ void SingleThreadProxy::SetVisible(bool visible) {
   // Changing visibility could change ShouldComposite().
 }
 
+void SingleThreadProxy::SetThrottleFrameProduction(bool throttle) {
+  TRACE_EVENT1("cc", "SingleThreadProxy::SetThrottleFrameProduction",
+               "throttle", throttle);
+  DebugScopedSetImplThread impl(this);
+  if (scheduler_on_impl_thread_)
+    scheduler_on_impl_thread_->SetThrottleFrameProduction(throttle);
+}
+
 void SingleThreadProxy::RequestNewOutputSurface() {
   DCHECK(Proxy::IsMainThread());
   DCHECK(layer_tree_host_->output_surface_lost());