Deliver IPC messages together with SwapCompositorFrame

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index 51b9b4f2e33d31a0663ff35821a4b8ac0f21f482..26e17fbe3d4bb7905cd99bf0a4a4cf1f013d591d 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -147,6 +147,8 @@ void LayerTreeHost::InitializeProxy(scoped_ptr<Proxy> proxy) {
 LayerTreeHost::~LayerTreeHost() {
   TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
 
+  BreakSwapPromises(SwapPromise::COMMIT_FAILS);
+
   overhang_ui_resource_.reset();
 
   if (root_layer_.get())
@@ -1250,8 +1252,6 @@ void LayerTreeHost::NotifySwapPromiseMonitorsOfSetNeedsCommit() {
 
 void LayerTreeHost::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
   DCHECK(swap_promise);
-  if (swap_promise_list_.size() > kMaxQueuedSwapPromiseNumber)
-    BreakSwapPromises(SwapPromise::SWAP_PROMISE_LIST_OVERFLOW);
   swap_promise_list_.push_back(swap_promise.Pass());
 }