Add an IPC method for Blink to call RapporService::RecordSample()

chrome/common/render_messages.h

 // 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.
 
 // Multiply-included file, no traditional include guard.
 #include <stdint.h>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 661 matching lines @@
 
 // Tells the browser process whether the web page wants the banner to be shown.
 // This is a reply from ChromeViewMsg_AppBannerPromptRequest.
 IPC_MESSAGE_ROUTED2(ChromeViewHostMsg_AppBannerPromptReply,
                     int /* request_id */,
                     blink::WebAppBannerPromptReply /* reply */)
 
 // Sent by the renderer to indicate that a fields trial has been activated.
 IPC_MESSAGE_CONTROL1(ChromeViewHostMsg_FieldTrialActivated,
                      std::string /* name */)
+
+// Record a sample string to a Rappor metric.
+IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRappor,
+                     std::string /* metric */,
+                     std::string /* sample */)
+
+// Record a domain and registry of a url to a Rappor metric.
+IPC_MESSAGE_CONTROL2(ChromeViewHostMsg_RecordRapporURL,
+                     std::string /* metric */,
+                     GURL /* sample url */)