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

chrome/browser/ui/webui/profiler_ui.h

Index: chrome/browser/ui/webui/profiler_ui.h
diff --git a/chrome/browser/ui/webui/profiler_ui.h b/chrome/browser/ui/webui/profiler_ui.h
index 090fbd63bfac7f2dcfec3c089925bd4228127257..abb50e5126069f4e0fdf30c9b3790ad9f1b759bf 100644
--- a/chrome/browser/ui/webui/profiler_ui.h
+++ b/chrome/browser/ui/webui/profiler_ui.h
@@ -6,13 +6,13 @@
 #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"
 
 // 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();
@@ -20,13 +20,14 @@ class ProfilerUI : public content::WebUIController {
   // 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 tracked_objects::ProcessDataSnapshot& profiler_data,
+      content::ProcessType process_type) OVERRIDE;
+
   // 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);
 };