Make start page logo web contents transparent.

chrome/browser/ui/app_list/app_list_view_delegate.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/app_list/app_list_view_delegate.h"
 
 #include <vector>
 
 #include "apps/custom_launcher_page_contents.h"
 #include "base/callback.h"
@@ skipping 673 matching lines @@
     return NULL;
 
   content::WebContents* web_contents = service->GetStartPageContents();
   if (!web_contents)
     return NULL;
 
   DCHECK_EQ(profile_, web_contents->GetBrowserContext());
   views::WebView* web_view = new views::WebView(
       web_contents->GetBrowserContext());
   web_view->SetPreferredSize(size);
+  web_view->SetResizeBackgroundColor(SK_ColorTRANSPARENT);
   web_view->SetWebContents(web_contents);
   return web_view;
 }
 
 std::vector<views::View*> AppListViewDelegate::CreateCustomPageWebViews(
     const gfx::Size& size) {
   std::vector<views::View*> web_views;
 
   for (ScopedVector<apps::CustomLauncherPageContents>::const_iterator it =
            custom_page_contents_.begin();
@@ skipping 91 matching lines @@
 
       // SigninManagerFactory is not a leaky singleton (unlike this class), and
       // its destructor will check that it has no remaining observers.
       scoped_observer_.RemoveAll();
       SigninManagerFactory::GetInstance()->RemoveObserver(this);
       break;
     default:
       NOTREACHED();
   }
 }