Collect profiler stats from browser child processes.

content/common/child_process_host.cc

Index: content/common/child_process_host.cc
===================================================================
--- content/common/child_process_host.cc	(revision 110669)
+++ content/common/child_process_host.cc	(working copy)
@@ -11,6 +11,7 @@
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
+#include "base/tracked_objects.h"
 #include "content/common/child_process_info.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/common/content_paths.h"
@@ -285,6 +286,9 @@
   Send(new ChildProcessMsg_SetIPCLoggingEnabled(enabled));
 #endif
 
+  bool enable = tracked_objects::ThreadData::tracking_status();
+  Send(new ChildProcessMsg_SetProfilerStatus(enable));
+
   Send(new ChildProcessMsg_AskBeforeShutdown());
 
   opening_channel_ = true;