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

chrome/renderer/chrome_content_renderer_client.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.
 
 #ifndef CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 #define CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 156 matching lines @@
       const blink::WebPluginParams& params,
       const ChromeViewHostMsg_GetPluginInfo_Output& output);
 
 #if defined(ENABLE_PLUGINS) && defined(ENABLE_EXTENSIONS)
   static bool IsExtensionOrSharedModuleWhitelisted(
       const GURL& url, const std::set<std::string>& whitelist);
 #endif
 
   static bool WasWebRequestUsedBySomeExtensions();
 
+  void RecordRappor(
+    const std::string& metric, const std::string& sample) override;

[jam, 2015/04/02 16:24:14]

nit: this should match the order of the interface, and also there shouldn't be
these blank lines. so moved this up to 

[kojii, 2015/04/03 06:50:53]

Done -- to be precise, methods above are not in the order of interface, so I put
as the last one to override. Hope this is ok?

+
  private:
   FRIEND_TEST_ALL_PREFIXES(ChromeContentRendererClientTest, NaClRestriction);
   FRIEND_TEST_ALL_PREFIXES(ChromeContentRendererClientTest,
                            ShouldSuppressErrorPage);
 
 #if defined(ENABLE_EXTENSIONS)
   // Gets extension by the given origin, regardless of whether the extension
   // is active in the current process.
   const extensions::Extension* GetExtensionByOrigin(
       const blink::WebSecurityOrigin& origin) const;
@@ skipping 49 matching lines @@
 #if defined(ENABLE_PRINT_PREVIEW)
   scoped_ptr<ChromePDFPrintClient> pdf_print_client_;
 #endif
 #if defined(ENABLE_PLUGINS)
   std::set<std::string> allowed_camera_device_origins_;
   std::set<std::string> allowed_compositor_origins_;
 #endif
 };
 
 #endif  // CHROME_RENDERER_CHROME_CONTENT_RENDERER_CLIENT_H_