[ash-md] Animates ToggleButton highlight to move it in sync with the thumb

ui/views/animation/ink_drop_host_view.cc

Index: ui/views/animation/ink_drop_host_view.cc
diff --git a/ui/views/animation/ink_drop_host_view.cc b/ui/views/animation/ink_drop_host_view.cc
index 89f320d2a50664a66dac3f9aafdfd320ef91dceb..bcb43aca11570163a6fd7a764df2e971c22edb53 100644
--- a/ui/views/animation/ink_drop_host_view.cc
+++ b/ui/views/animation/ink_drop_host_view.cc
@@ -108,6 +108,7 @@ class InkDropHostView::InkDropGestureHandler : public ui::EventHandler {
 
 InkDropHostView::InkDropHostView()
     : ink_drop_(new InkDropStub()),
+      ink_drop_layer_(nullptr),
       ink_drop_size_(kInkDropSize, kInkDropSize),
       ink_drop_visible_opacity_(kInkDropVisibleOpacity),
       old_paint_to_layer_(false),
@@ -125,6 +126,7 @@ void InkDropHostView::AddInkDropLayer(ui::Layer* ink_drop_layer) {
   layer()->SetFillsBoundsOpaquely(false);
   layer()->Add(ink_drop_layer);
   layer()->StackAtBottom(ink_drop_layer);
+  ink_drop_layer_ = ink_drop_layer;
 }
 
 void InkDropHostView::RemoveInkDropLayer(ui::Layer* ink_drop_layer) {
@@ -133,6 +135,8 @@ void InkDropHostView::RemoveInkDropLayer(ui::Layer* ink_drop_layer) {
   // would be wrong.
   if (destroying_)
     return;
+  DCHECK_EQ(ink_drop_layer_, ink_drop_layer);
+  ink_drop_layer_ = nullptr;
   layer()->Remove(ink_drop_layer);
   SetPaintToLayer(old_paint_to_layer_);
 }
@@ -147,6 +151,14 @@ std::unique_ptr<InkDropHighlight> InkDropHostView::CreateInkDropHighlight()
       gfx::RectF(GetLocalBounds()).CenterPoint());
 }
 
+void InkDropHostView::OffsetInkDropRipple(const gfx::Vector2d& offset) {
+  if (!ink_drop_layer_)
+    return;
+  gfx::Transform transform;
+  transform.Translate(offset.x(), offset.y());
+  ink_drop_layer_->SetTransform(transform);
+}
+
 std::unique_ptr<InkDropRipple> InkDropHostView::CreateDefaultInkDropRipple(
     const gfx::Point& center_point) const {
   std::unique_ptr<InkDropRipple> ripple(new SquareInkDropRipple(