alternate ntp: clip middle omnibox when resizing browser window

chrome/browser/ui/views/location_bar/location_bar_container_aura.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 "chrome/browser/ui/views/location_bar/location_bar_container.h"
 
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 
 void LocationBarContainer::SetInToolbar(bool in_toolbar) {
   if (animator_.IsAnimating())
     animator_.Cancel();
   // See comment in PlatformInit() as to why we do this.
   SetPaintToLayer(!in_toolbar);
   if (!in_toolbar) {
     layer()->SetFillsBoundsOpaquely(false);
+    layer()->SetMasksToBounds(true);

[sky, 2012/09/12 21:07:31]

Add a comment why you need this.

[kuan, 2012/09/12 21:33:04]

Done.

     StackAtTop();
   }
 }
 
 void LocationBarContainer::OnFocus() {
 }
 
 void LocationBarContainer::PlatformInit() {
   view_parent_ = this;
   // Ideally we would turn on layer painting here, but this poses problems with
   // infobar arrows. So, instead we turn on the layer when animating and turn it
   // off when done.
 }
 
 // static
 SkColor LocationBarContainer::GetBackgroundColor() {
   return instant_extended_api_enabled_ ?
       SK_ColorWHITE :
       LocationBarView::kOmniboxBackgroundColor;
 }
 
 void LocationBarContainer::StackAtTop() {
   // TODO: this is hack. The problem is NativeViewHostAura does an AddChild(),
   // which places its layer at the top of the stack.
   if (layer())
     layer()->parent()->StackAtTop(layer());
 }