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

content/common/view_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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 1496 matching lines @@
 // Unregister the registered handler for URL requests with the given scheme.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_UnregisterProtocolHandler,
                     std::string /* scheme */,
                     GURL /* url */,
                     bool /* user_gesture */)
 
 // Send back a string to be recorded by UserMetrics.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_UserMetricsRecordAction,
                      std::string /* action */)
 
+// Send back a string to be recorded by UserMetrics.
+IPC_MESSAGE_CONTROL2(ViewHostMsg_UserMetricsRecordRappor,
+                     std::string /* metric */,
+                     std::string /* sample */)
+
 // Notifies the browser that the page was or was not saved as MHTML.
 IPC_MESSAGE_CONTROL2(ViewHostMsg_SavedPageAsMHTML,
                      int /* job_id */,
                      int64 /* size of the MHTML file, -1 if error */)
 
 IPC_MESSAGE_ROUTED3(ViewHostMsg_SendCurrentPageAllSavableResourceLinks,
                     std::vector<GURL> /* all savable resource links */,
                     std::vector<content::Referrer> /* all referrers */,
                     std::vector<GURL> /* all frame links */)
 
@@ skipping 146 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             base::string16 /* characters */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.