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

content/public/browser/profiler_subscriber.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 CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_
 #define CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_
 
 #include "content/common/content_export.h"
+#include "content/public/common/process_type.h"
 
-namespace base {
-class DictionaryValue;
+namespace tracked_objects {
+struct ProcessDataSnapshot;
 }
 
 namespace content {
 
 // Objects interested in receiving profiler data derive from ProfilerSubscriber.
 class CONTENT_EXPORT ProfilerSubscriber {
  public:
   virtual ~ProfilerSubscriber() {}
 
   // Send number of pending processes to subscriber. |end| is set to true if it
-  // is the last time. This is called on UI thread.
+  // is the last time. This is called on the UI thread.
   virtual void OnPendingProcesses(int sequence_number,
                                   int pending_processes,
                                   bool end) = 0;
 
-  // Send profiler_data back to subscriber.
-  // This is called on UI thread.
+  // Send |profiler_data| back to subscriber.
+  // This is called on the UI thread.
   virtual void OnProfilerDataCollected(
       int sequence_number,
-      base::DictionaryValue* profiler_data) = 0;
+      const tracked_objects::ProcessDataSnapshot& profiler_data,
+      ProcessType process_type) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PROFILER_SUBSCRIBER_H_