Queue latency info swap promises in a separate already-active queue.

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 47b6351ca6f8d7bdc1b503cc2ec77a5e63d4afc6..4fbf8ee24a9c4eac5b4a4160870c27e5616c77bb 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -286,6 +286,7 @@ class CC_EXPORT LayerTreeImpl {
   // Call this function when you expect there to be a swap buffer.
   // See swap_promise.h for how to use SwapPromise.
   void QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise);
+  void QueueActiveTreeSwapPromise(scoped_ptr<SwapPromise> swap_promise);

[danakj, 2015/08/14 17:47:39]

Explain this in a comment?

[Tobias Sargeant, 2015/08/18 11:22:15]

Done.

 
   // Take the |new_swap_promise| and append it to |swap_promise_list_|.
   void PassSwapPromises(ScopedPtrVector<SwapPromise>* new_swap_promise);
@@ -446,6 +447,7 @@ class CC_EXPORT LayerTreeImpl {
   bool has_ever_been_drawn_;
 
   ScopedPtrVector<SwapPromise> swap_promise_list_;
+  ScopedPtrVector<SwapPromise> active_tree_swap_promise_list_;
 
   UIResourceRequestQueue ui_resource_request_queue_;