Add chrome-search: access from Instant overlay

chrome/browser/ui/webui/ntp/thumbnail_source.cc

Index: chrome/browser/ui/webui/ntp/thumbnail_source.cc
diff --git a/chrome/browser/ui/webui/ntp/thumbnail_source.cc b/chrome/browser/ui/webui/ntp/thumbnail_source.cc
index 561adb5cb88054244e7996f9b7cc95f344515dca..706b760592df07346b0058a3aa2c0cbb9eee0d0b 100644
--- a/chrome/browser/ui/webui/ntp/thumbnail_source.cc
+++ b/chrome/browser/ui/webui/ntp/thumbnail_source.cc
@@ -7,12 +7,14 @@
 #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.
@@ -52,3 +54,10 @@ MessageLoop* ThumbnailSource::MessageLoopForRequestPath(
   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);
+}