Update LabelButtons in the Toolbar for Material Design

ui/views/style/platform_style.cc

 // Copyright 2015 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/style/platform_style.h"
 
+#include "ui/base/resource/material_design/material_design_controller.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/button/label_button_border.h"
 
 namespace views {
 
-#if !defined(OS_MACOSX)
+#if defined(OS_CHROMEOS)
 // static
 scoped_ptr<LabelButtonBorder> PlatformStyle::CreateLabelButtonBorder(
     Button::ButtonStyle style) {
-  return make_scoped_ptr(new LabelButtonAssetBorder(style));
+  if (!ui::MaterialDesignController::IsModeMaterial() ||
+      style != Button::STYLE_TEXTBUTTON) {
+    return make_scoped_ptr(new LabelButtonAssetBorder(style));
+  }
+
+  // The material design spec for Chrome OS includes no visual effects for
+  // button states, so a non-asset border with insets is used.
+  scoped_ptr<LabelButtonBorder> border(new views::LabelButtonBorder());
+  border->set_insets(views::LabelButtonAssetBorder::GetDefaultInsetsForStyle(
+      Button::STYLE_TEXTBUTTON));
+  return border.Pass();
+}
+#elif !defined(OS_MACOSX)
+// static
+scoped_ptr<LabelButtonBorder> PlatformStyle::CreateLabelButtonBorder(
+    Button::ButtonStyle style) {
+  scoped_ptr<LabelButtonAssetBorder> border(new LabelButtonAssetBorder(style));
+  // The material design spec does not include a visual effect for the
+  // STATE_HOVERED button state so we have to remove the default one added by
+  // LabelButtonAssetBorder.
+  if (ui::MaterialDesignController::IsModeMaterial())
+    border->SetPainter(false, Button::STATE_HOVERED, nullptr);
+  return border.Pass();
 }
 #endif
 
 #if !defined(OS_LINUX) || defined(OS_CHROMEOS)
 // static
 scoped_ptr<Border> PlatformStyle::CreateThemedLabelButtonBorder(
     LabelButton* button) {
   return button->CreateDefaultBorder();
 }
 #endif
 
 }  // namespace views