Add chrome-search: access from Instant overlay

chrome/browser/ui/webui/ntp/thumbnail_source.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/webui/ntp/thumbnail_source.h"
 
 #include "base/callback.h"
 #include "base/message_loop.h"
 #include "base/memory/ref_counted_memory.h"
+#include "chrome/browser/instant/instant_io_context.h"
 #include "chrome/browser/thumbnails/thumbnail_service.h"
 #include "chrome/browser/thumbnails/thumbnail_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
 #include "grit/theme_resources.h"
+#include "net/url_request/url_request.h"
 #include "ui/base/resource/resource_bundle.h"
 
 // Set ThumbnailService now as Profile isn't thread safe.
 ThumbnailSource::ThumbnailSource(Profile* profile)
     : thumbnail_service_(ThumbnailServiceFactory::GetForProfile(profile)) {
 }
 
 ThumbnailSource::~ThumbnailSource() {
 }
 
@@ skipping 19 matching lines @@
   // drag the image they get no extension.
   return "image/png";
 }
 
 MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
     const std::string& path) const {
   // TopSites can be accessed from the IO thread.
   return thumbnail_service_.get() ?
       NULL : content::URLDataSource::MessageLoopForRequestPath(path);
 }
+
+bool ThumbnailSource::ShouldServiceRequest(
+    const net::URLRequest* request) const {
+  if (request->url().SchemeIs(chrome::kChromeSearchScheme))
+    return InstantIOContext::ShouldServiceRequest(request);
+  return URLDataSource::ShouldServiceRequest(request);
+}