cc: Set the max frames pending from the thread proxy.

cc/thread_proxy.cc

Index: cc/thread_proxy.cc
diff --git a/cc/thread_proxy.cc b/cc/thread_proxy.cc
index b7e0e7c405e9c5518d600b6b875f37ab72fbabca..173b2fc4ef0c936273c1958992bd0a71f82a1578 100644
--- a/cc/thread_proxy.cc
+++ b/cc/thread_proxy.cc
@@ -938,6 +938,11 @@ void ThreadProxy::initializeRendererOnImplThread(CompletionEvent* completion, bo
                 capabilities->usingSwapCompleteCallback);
     }
 
+    int maxFramesPending = FrameRateController::defaultMaxFramesPending;
+    if (m_layerTreeHostImpl->outputSurface()->Capabilities().has_parent_compositor)
+        maxFramesPending = 1;
+    m_schedulerOnImplThread->setMaxFramesPending(maxFramesPending);
+
     completion->signal();
 }