Add support for bounds animations

cc/animation/animation_player.cc

Index: cc/animation/animation_player.cc
diff --git a/cc/animation/animation_player.cc b/cc/animation/animation_player.cc
index 3174dcbdab096b0c5b8c3269e6a638372bdbfa47..b08284f6ad190715f5c313dbd5be81756cc478ca 100644
--- a/cc/animation/animation_player.cc
+++ b/cc/animation/animation_player.cc
@@ -784,6 +784,16 @@ void AnimationPlayer::TickAnimations(base::TimeTicks monotonic_time) {
               animations_[i]->affects_pending_elements());
           break;
         }
+
+        case TargetProperty::BOUNDS: {
+          const SizeAnimationCurve* size_animation_curve =
+              animations_[i]->curve()->ToSizeAnimationCurve();
+          const gfx::SizeF size = size_animation_curve->GetValue(trimmed);
+          element_animations_->NotifyClientBoundsAnimated(
+              size, animations_[i]->affects_active_elements(),
+              animations_[i]->affects_pending_elements());
+          break;
+        }
       }
     }
   }