[UMA] Use proper C++ objects to serialize tracked_objects across process boundaries.

chrome/browser/ui/webui/profiler_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_PROFILER_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_PROFILER_UI_H_
 #pragma once
 
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/values.h"
+#include "chrome/browser/metrics/tracking_synchronizer_observer.h"
 #include "content/public/browser/web_ui_controller.h"
 
+namespace content {
+struct SerializedProfilerData;
+}
+
 // The C++ back-end for the chrome://profiler webui page.
-class ProfilerUI : public content::WebUIController {
+class ProfilerUI : public content::WebUIController,
+                   public chrome_browser_metrics::TrackingSynchronizerObserver {
  public:
   explicit ProfilerUI(content::WebUI* web_ui);
   virtual ~ProfilerUI();
 
   // Get the tracking data from TrackingSynchronizer.
   void GetData();
 
-  // Send the data to the renderer.
-  void ReceivedData(base::Value* value);
+ private:
+  // TrackingSynchronizerObserver:
+  virtual void ReceivedProfilerData(
+      const content::SerializedProfilerData& data) OVERRIDE;
 
- private:
   // Used to get |weak_ptr_| to self on the UI thread.
-  scoped_ptr<base::WeakPtrFactory<ProfilerUI> > ui_weak_ptr_factory_;
-  base::WeakPtr<ProfilerUI> ui_weak_ptr_;
+  base::WeakPtrFactory<ProfilerUI> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfilerUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_PROFILER_UI_H_