Take time_offset into account when ticking animations that are Starting

cc/animation/animation.cc

 // Copyright 2012 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 "cc/animation/animation.h"
 
 #include <cmath>
 
 #include "base/debug/trace_event.h"
 #include "base/strings/string_util.h"
@@ skipping 149 matching lines @@
   double trimmed = monotonic_time + time_offset_;
 
   // If we're paused, time is 'stuck' at the pause time.
   if (run_state_ == Paused)
     trimmed = pause_time_;
 
   // Returned time should always be relative to the start time and should
   // subtract all time spent paused.
   trimmed -= start_time_ + total_paused_time_;
 
+  // If we're just starting or we're waiting on receiving a start time,
+  // time is 'stuck' at the initial state.
+  if ((run_state_ == Starting && !has_set_start_time()) ||
+      needs_synchronized_start_time())
+    trimmed = time_offset_;
+
   // Zero is always the start of the animation.
   if (trimmed <= 0)
     return 0;
 
   // Always return zero if we have no iterations.
   if (!iterations_)
     return 0;
 
   // Don't attempt to trim if we have no duration.
   if (curve_->Duration() <= 0)
@@ skipping 49 matching lines @@
   // the main thread.
   if (run_state_ == Animation::Paused ||
       other->run_state_ == Animation::Paused) {
     other->run_state_ = run_state_;
     other->pause_time_ = pause_time_;
     other->total_paused_time_ = total_paused_time_;
   }
 }
 
 }  // namespace cc