Plumb activation time to main

cc/trees/proxy_main.h

Index: cc/trees/proxy_main.h
diff --git a/cc/trees/proxy_main.h b/cc/trees/proxy_main.h
index 3d97276193aa75690a6e8c6d0c2c5a60e9b1d57d..4ff01a7c4e2dfad5675c53b2b869381854575cad 100644
--- a/cc/trees/proxy_main.h
+++ b/cc/trees/proxy_main.h
@@ -61,6 +61,10 @@ class CC_EXPORT ProxyMain : public Proxy {
     return final_pipeline_stage_;
   }
 
+  BeginFrameArgs BeginFrameArgsForTesting() {
+    return begin_frame_args_for_testing_;
+  }
+
  private:
   // Proxy implementation.
   bool IsStarted() const override;
@@ -129,6 +133,8 @@ class CC_EXPORT ProxyMain : public Proxy {
   // run before we destroy it on the impl thread.
   std::unique_ptr<ProxyImpl> proxy_impl_;
 
+  BeginFrameArgs begin_frame_args_for_testing_;

[brianderson, 2017/04/13 22:36:37]

Can you store this in LayerTreeTest from an overridden BeginMainFrame() or
WillBeginMainFrame() instead?

[panicker, 2017/04/14 22:02:45]

Can you elaborate on what you mean exactly:
- Store it in LayerTreeHostClientForTesting in layer_tree_test 
- and Update WillBeginMainFrame to take args (lots of references)?
or something else ?

[panicker, 2017/04/17 21:54:50]

Addressed

+
   base::WeakPtrFactory<ProxyMain> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyMain);