[New Tab Page] Add Field Trial support to the Local NTP

chrome/browser/search/local_ntp_source.h

Index: chrome/browser/search/local_ntp_source.h
diff --git a/chrome/browser/search/local_ntp_source.h b/chrome/browser/search/local_ntp_source.h
index 66fd76c1dc9c9a6cf4f45d0f06ea7989793c153d..2cea84999f2d70f54666d970a96ecc165fd534f7 100644
--- a/chrome/browser/search/local_ntp_source.h
+++ b/chrome/browser/search/local_ntp_source.h
@@ -32,6 +32,12 @@ class LocalNtpSource : public content::URLDataSource {
       const net::URLRequest* request) const OVERRIDE;
   virtual std::string GetContentSecurityPolicyFrameSrc() const OVERRIDE;
 
+  // Sends a local resource with a specific |class_name| substituted.
+  void SendResourceWithClass(
+    int resource_id,
+    const std::string& class_name,
+    const content::URLDataSource::GotDataCallback& callback);
+
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(LocalNtpSource);