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

content/public/browser/user_metrics.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 CONTENT_PUBLIC_BROWSER_USER_METRICS_H_
 #define CONTENT_PUBLIC_BROWSER_USER_METRICS_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/metrics/user_metrics_action.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // Wrappers around functions defined in base/metrics/user_metrics.h, refer to
 // that header for full documentation. These wrappers can be called from any
 // thread (they will post back to the UI thread to do the recording).
 
 CONTENT_EXPORT void RecordAction(const base::UserMetricsAction& action);
 CONTENT_EXPORT void RecordComputedAction(const std::string& action);
+CONTENT_EXPORT void RecordRappor(
+    const std::string& metric,
+    const std::string& sample);
+
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_USER_METRICS_H_