Making BeginFrameArgs work with TRACE_EVENT system.

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 88c8c74f701d2f4aa0a8980cff8b01f2a21335ea..caed7f4ca763e814d80028448b70b3961eb1196e 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -394,7 +394,8 @@ void Scheduler::SetupPollingMechanisms(bool needs_begin_frame) {
 // If the scheduler is busy, we queue the BeginFrame to be handled later as
 // a BeginRetroFrame.
 void Scheduler::BeginFrame(const BeginFrameArgs& args) {
-  TRACE_EVENT1("cc", "Scheduler::BeginFrame", "frame_time", args.frame_time);
+  TRACE_EVENT1("cc", "Scheduler::BeginFrame", "args", args.AsTrace());
+  // scoped_refptr<base::debug::ConvertableToTraceFormat>(args));
   DCHECK(settings_.throttle_frame_production);
 
   bool should_defer_begin_frame;
@@ -488,8 +489,7 @@ void Scheduler::PostBeginRetroFrameIfNeeded() {
 // for a BeginMainFrame+activation to complete before it times out and draws
 // any asynchronous animation and scroll/pinch updates.
 void Scheduler::BeginImplFrame(const BeginFrameArgs& args) {
-  TRACE_EVENT1(
-      "cc", "Scheduler::BeginImplFrame", "frame_time", args.frame_time);
+  TRACE_EVENT1("cc", "Scheduler::BeginImplFrame", "args", args.AsTrace());
   DCHECK(state_machine_.begin_impl_frame_state() ==
          SchedulerStateMachine::BEGIN_IMPL_FRAME_STATE_IDLE);
   DCHECK(state_machine_.HasInitializedOutputSurface());
@@ -713,6 +713,9 @@ scoped_ptr<base::Value> Scheduler::StateAsValue() const {
                               !poll_for_draw_triggers_task_.IsCancelled());
   scheduler_state->SetBoolean("advance_commit_state_task_",
                               !advance_commit_state_task_.IsCancelled());
+  scheduler_state->Set("begin_impl_frame_args",
+                       begin_impl_frame_args_.AsValue().release());
+
   state->Set("scheduler_state", scheduler_state.release());
 
   scoped_ptr<base::DictionaryValue> client_state(new base::DictionaryValue);