Take time_offset into account when ticking animations that are Starting

cc/animation/animation.cc

Index: cc/animation/animation.cc
diff --git a/cc/animation/animation.cc b/cc/animation/animation.cc
index 214b8bfc47f30529c38625724e002e2eb1845395..b509cfd994fceae049e3415cf914518f89592706 100644
--- a/cc/animation/animation.cc
+++ b/cc/animation/animation.cc
@@ -167,6 +167,12 @@ double Animation::TrimTimeToCurrentIteration(double monotonic_time) const {
   // 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;