Added material design mouse hover feedback support.

chrome/browser/ui/views/toolbar/toolbar_button.cc

 // Copyright 2013 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 "chrome/browser/ui/views/toolbar/toolbar_button.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 126 matching lines @@
 
 void ToolbarButton::OnMouseCaptureLost() {
 }
 
 void ToolbarButton::OnMouseExited(const ui::MouseEvent& event) {
   // Starting a drag results in a MouseExited, we need to ignore it.
   // A right click release triggers an exit event. We want to
   // remain in a PUSHED state until the drop down menu closes.
   if (state() != STATE_DISABLED && !InDrag() && state() != STATE_PRESSED)
     SetState(STATE_NORMAL);
+  UpdateInkDropHoverState();

[varkha, 2016/01/22 15:45:32]

Would this not be taken care by the delegate's OnMouseEvent?

[bruthig, 2016/01/25 22:39:17]

Removed.

 }
 
 void ToolbarButton::OnGestureEvent(ui::GestureEvent* event) {
   if (menu_showing_) {
     // While dropdown menu is showing the button should not handle gestures.
     event->StopPropagation();
     return;
   }
 
   LabelButton::OnGestureEvent(event);
@@ skipping 119 matching lines @@
   SetMouseHandler(nullptr);
 
   // Set the state back to normal after the drop down menu is closed.
   if (state() != STATE_DISABLED)
     SetState(STATE_NORMAL);
 }
 
 const char* ToolbarButton::GetClassName() const {
   return "ToolbarButton";
 }