Hides ink ripple when a button drag is started

ui/views/controls/button/custom_button.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/custom_button.h"
 
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ skipping 269 matching lines @@
   if (!context_menu_controller())
     return;
 
   // We're about to show the context menu. Showing the context menu likely means
   // we won't get a mouse exited and reset state. Reset it now to be sure.
   if (state_ != STATE_DISABLED)
     SetState(STATE_NORMAL);
   View::ShowContextMenu(p, source_type);
 }
 
+void CustomButton::OnDragStarted(const ui::LocatedEvent& event) {
+  Button::OnDragStarted(event);
+  if (ink_drop_delegate_)
+    ink_drop_delegate_->OnAction(InkDropState::HIDDEN);
+}
+
 void CustomButton::OnDragDone() {
   // Only reset the state to normal if the button isn't currently disabled
   // (since disabled buttons may still be able to be dragged).
   if (state_ != STATE_DISABLED)
     SetState(STATE_NORMAL);
   if (ink_drop_delegate_)
     ink_drop_delegate_->OnAction(InkDropState::HIDDEN);
 }
 
 void CustomButton::GetAccessibleState(ui::AXViewState* state) {
@@ skipping 110 matching lines @@
   return GetWidget() && GetWidget()->GetTopLevelWidget() != GetWidget();
 }
 
 bool CustomButton::FocusInChildWidget() const {
   return GetWidget() &&
          GetWidget()->GetRootView()->Contains(
              GetFocusManager()->GetFocusedView());
 }
 
 }  // namespace views