Allow browser compositor control over frames pending with surfaceless rendering on freon.

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 b6084bc0f6705b3f9a1a22dce3f2c0f2aefebb42..8a06dd2e1315a086ac18690677d543ebe58f5d7b 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -540,6 +540,11 @@ void SingleThreadProxy::SetEstimatedParentDrawTime(base::TimeDelta draw_time) {
     scheduler_on_impl_thread_->SetEstimatedParentDrawTime(draw_time);
 }
 
+void SingleThreadProxy::SetMaxSwapsPendingOnImplThread(int max) {
+  if (scheduler_on_impl_thread_)
+    scheduler_on_impl_thread_->SetMaxSwapsPending(max);
+}
+
 void SingleThreadProxy::DidSwapBuffersOnImplThread() {
   TRACE_EVENT0("cc", "SingleThreadProxy::DidSwapBuffersOnImplThread");
   if (scheduler_on_impl_thread_)