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

chrome/browser/task_profiler/task_profiler_data_serializer.cc

Index: chrome/browser/task_profiler/task_profiler_data_serializer.cc
diff --git a/chrome/browser/task_profiler/task_profiler_data_serializer.cc b/chrome/browser/task_profiler/task_profiler_data_serializer.cc
index fd767418a5ce7f0eab1b2f2f002c6b4aa2c9b8c8..4a8fdb0361b794d81944afd539495f9335877a13 100644
--- a/chrome/browser/task_profiler/task_profiler_data_serializer.cc
+++ b/chrome/browser/task_profiler/task_profiler_data_serializer.cc
@@ -10,11 +10,13 @@
 #include "base/time.h"
 #include "base/tracked_objects.h"
 #include "content/public/common/content_client.h"
+#include "content/public/common/process_type.h"
+#include "content/public/common/serialized_profiler_data.h"
 #include "googleurl/src/gurl.h"
 
 namespace task_profiler {
 
-bool TaskProfilerDataSerializer::WriteToFile(const FilePath &path) {
+bool TaskProfilerDataSerializer::WriteToFile(const FilePath& path) {
   std::string output;
   JSONStringValueSerializer serializer(&output);
   serializer.set_pretty_print(true);
@@ -29,10 +31,16 @@ bool TaskProfilerDataSerializer::WriteToFile(const FilePath &path) {
   root->SetString("userAgent", content::GetUserAgent(GURL()));
 
   // TODO(ramant): Collect data from other processes, then add that data to the
-  // 'per_process_data' array here.
-  base::DictionaryValue* this_process_data =
-      tracked_objects::ThreadData::ToValue(false);
-  per_process_data->Append(this_process_data);
+  // 'per_process_data' array here. Should leverage the TrackingSynchronizer
+  // class to implement this.
+  content::SerializedProfilerData this_process_data(
+      content::PROCESS_TYPE_BROWSER);
+  tracked_objects::ThreadData::ToSerializedProcessData(false,
+                                                       &this_process_data);
+  scoped_ptr<base::DictionaryValue> this_process_data_value(
+      new base::DictionaryValue);
+  this_process_data.ToValue(this_process_data_value.get());
+  per_process_data->Append(this_process_data_value.release());
 
   shutdown_snapshot->SetInteger(
       "timestamp",