Add support for bounds animations

cc/animation/element_animations.cc

Index: cc/animation/element_animations.cc
diff --git a/cc/animation/element_animations.cc b/cc/animation/element_animations.cc
index ebb9c3fc83ee7853a0dfb5d0ff342b792c774aab..e43ac4fc838e0cca53c696fd02def912de416e14 100644
--- a/cc/animation/element_animations.cc
+++ b/cc/animation/element_animations.cc
@@ -354,6 +354,15 @@ void ElementAnimations::NotifyClientScrollOffsetAnimated(
     OnScrollOffsetAnimated(ElementListType::PENDING, scroll_offset);
 }
 
+void ElementAnimations::NotifyClientBoundsAnimated(
+    const gfx::SizeF& size,
+    bool notify_active_elements,
+    bool notify_pending_elements) {
+  // TODO(vollick): once we have an animation observer, we can remove client
+  // animated notifications we do not use in element animations, such as this
+  // one.
+}
+
 void ElementAnimations::UpdateClientAnimationState() {
   if (!element_id())
     return;