[ash-md] Fades overview header in and out

chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.cc

 // Copyright 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 "chrome/browser/ui/views/frame/browser_non_client_frame_view_ash.h"
 
 #include <algorithm>
 
 #include "ash/common/ash_layout_constants.h"
 #include "ash/common/frame/caption_buttons/frame_caption_button_container_view.h"
@@ skipping 342 matching lines @@
   if (browser_view()->initialized() && (child == caption_button_container_)) {
     InvalidateLayout();
     frame()->GetRootView()->Layout();
   }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // ash::ShellObserver:
 
 void BrowserNonClientFrameViewAsh::OnOverviewModeStarting() {
+  frame()->GetNativeWindow()->SetProperty(aura::client::kTopViewColor,
+                                          GetFrameColor());
   if (ash::MaterialDesignController::IsOverviewMaterial())
     caption_button_container_->SetVisible(false);
 }
 
 void BrowserNonClientFrameViewAsh::OnOverviewModeEnded() {
   if (ash::MaterialDesignController::IsOverviewMaterial())
     caption_button_container_->SetVisible(true);
 }
 
 void BrowserNonClientFrameViewAsh::OnMaximizeModeStarted() {
@@ skipping 188 matching lines @@
     // TODO(pkasting): The "2 *" part of this makes no sense to me.
     canvas->TileImageInt(*right, 0, 0, w - (2 * kClientEdgeThickness) - img_w,
                          img_y, img_w, img_h);
 
     // Toolbar/content separator.
     toolbar_bounds.Inset(kClientEdgeThickness, h - kClientEdgeThickness,
                          kClientEdgeThickness, 0);
     canvas->FillRect(toolbar_bounds, separator_color);
   }
 }