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

content/browser/user_metrics.cc

 // Copyright (c) 2011 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.
 
 #include "content/public/browser/user_metrics.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/metrics/user_metrics.h"
@@ skipping 18 matching lines @@
     BrowserThread::PostTask(
         BrowserThread::UI,
         FROM_HERE,
         base::Bind(&RecordComputedAction, action));
     return;
   }
 
   base::RecordComputedAction(action);
 }
 
+CONTENT_EXPORT void RecordRappor(
+    const std::string& metric,
+    const std::string& sample) {
+  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
+    BrowserThread::PostTask(
+        BrowserThread::UI,
+        FROM_HERE,
+        base::Bind(&RecordRappor, metric, sample));
+    return;
+  }
+
+  base::RecordRappor(metric, sample);
+}
+
 }  // namespace content