Round the corners of bookmark button ink drop effects.

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 789f1b5e76eb05885906fafa8285d549cbc0dc59..802a4ce9ff369675f7682496c486c4b6282b5fa6 100644
--- a/ui/views/animation/ink_drop_host_view.cc
+++ b/ui/views/animation/ink_drop_host_view.cc
@@ -132,9 +132,7 @@ void InkDropHostView::AddInkDropLayer(ui::Layer* ink_drop_layer) {
     SetPaintToLayer();
 
   layer()->SetFillsBoundsOpaquely(false);
-  ink_drop_mask_ = CreateInkDropMask();
-  if (ink_drop_mask_)
-    ink_drop_layer->SetMaskLayer(ink_drop_mask_->layer());
+  InstallInkDropMask(ink_drop_layer);
   layer()->Add(ink_drop_layer);
   layer()->StackAtBottom(ink_drop_layer);
 }
@@ -280,6 +278,16 @@ InkDrop* InkDropHostView::GetInkDrop() {
   return ink_drop_.get();
 }
 
+void InkDropHostView::InstallInkDropMask(ui::Layer* ink_drop_layer) {
+  ink_drop_mask_ = CreateInkDropMask();
+  if (ink_drop_mask_)
+    ink_drop_layer->SetMaskLayer(ink_drop_mask_->layer());
+}
+
+void InkDropHostView::ResetInkDropMask() {
+  ink_drop_mask_.reset();
+}
+
 std::unique_ptr<InkDropImpl> InkDropHostView::CreateDefaultInkDropImpl() {
   std::unique_ptr<InkDropImpl> ink_drop =
       base::MakeUnique<InkDropImpl>(this, size());