Plumb activation time to main

ui/android/window_android.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/android/window_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
@@ skipping 84 matching lines @@
   if (observer_count_ <= 0)
     window_->SetNeedsBeginFrames(false);
 }
 
 void WindowAndroid::WindowBeginFrameSource::OnVSync(
     base::TimeTicks frame_time,
     base::TimeDelta vsync_period) {
   // frame time is in the past, so give the next vsync period as the deadline.
   base::TimeTicks deadline = frame_time + vsync_period;
   last_begin_frame_args_ = cc::BeginFrameArgs::Create(
-      BEGINFRAME_FROM_HERE, source_id(), next_sequence_number_, frame_time,
+      BEGINFRAME_FROM_HERE, source_id(), next_sequence_number_, 0, frame_time,

[Ted C, 2017/04/18 23:11:06]

should this be kDefaultSourceFrameNumber instead of 0?

[panicker, 2017/04/19 17:22:09]

Done.

       deadline, vsync_period, cc::BeginFrameArgs::NORMAL);
   DCHECK(last_begin_frame_args_.IsValid());
   next_sequence_number_++;
 
   for (auto& obs : observers_)
     obs.OnBeginFrame(last_begin_frame_args_);
 }
 
 void WindowAndroid::WindowBeginFrameSource::OnPauseChanged(bool paused) {
   paused_ = paused;
@@ skipping 165 matching lines @@
 // ----------------------------------------------------------------------------
 // Native JNI methods
 // ----------------------------------------------------------------------------
 
 jlong Init(JNIEnv* env, const JavaParamRef<jobject>& obj, int sdk_display_id) {
   WindowAndroid* window = new WindowAndroid(env, obj, sdk_display_id);
   return reinterpret_cast<intptr_t>(window);
 }
 
 }  // namespace ui