Add trace code to track all posted tasks in message_loop.

base/debug/trace_event.cc

 // 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.
 
 #include "base/debug/trace_event.h"
 
 #include <algorithm>
 
 #if defined(OS_WIN)
 #include "base/debug/trace_event_win.h"
 #endif
 #include "base/format_macros.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/process_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread_local.h"
 #include "base/utf_string_conversions.h"
 #include "base/stl_util.h"
 #include "base/time.h"
 
 #define USE_UNRELIABLE_NOW
 
+class DeleteTraceLogForTesting {
+ public:
+  static void Delete() {
+    Singleton<base::debug::TraceLog,
+              StaticMemorySingletonTraits<base::debug::TraceLog> >::OnExit(0);
+  }
+};
+
 namespace base {
 namespace debug {
 
 // Controls the number of trace events we will buffer in-memory
 // before throwing them away.
 const size_t kTraceEventBufferSize = 500000;
 const size_t kTraceEventBatchSize = 1000;
 
 #define TRACE_EVENT_MAX_CATEGORIES 100
 
@@ skipping 370 matching lines @@
     output_callback_copy = output_callback_;
   }  // release lock
 
   if (output_callback_copy.is_null())
     return;
 
   for (size_t i = 0;
        i < previous_logged_events.size();
        i += kTraceEventBatchSize) {
     scoped_refptr<RefCountedString> json_events_str_ptr =
-      new RefCountedString();
+        new RefCountedString();
     TraceEvent::AppendEventsAsJSON(previous_logged_events,
                                    i,
                                    kTraceEventBatchSize,
                                    &(json_events_str_ptr->data));
     output_callback_copy.Run(json_events_str_ptr);
   }
 }
 
 int TraceLog::AddTraceEvent(TraceEventPhase phase,
                             const TraceCategory* category,
@@ skipping 116 matching lines @@
           TraceEvent(static_cast<unsigned long>(base::GetCurrentProcId()),
                      it->first,
                      TimeTicks(), base::debug::TRACE_EVENT_PHASE_METADATA,
                      g_category_metadata, "thread_name",
                      "name", it->second,
                      NULL, 0,
                      false));
   }
 }
 
+void TraceLog::DeleteForTesting() {
+  DeleteTraceLogForTesting::Delete();
+}
+
 void TraceLog::Resurrect() {
   StaticMemorySingletonTraits<TraceLog>::Resurrect();
 }
 
 namespace internal {
 
 void TraceEndOnScopeClose::Initialize(const TraceCategory* category,
                                       const char* name) {
   data_.category = category;
   data_.name = name;
@@ skipping 33 matching lines @@
         NULL, 0, NULL, 0,
         p_data_->threshold_begin_id, p_data_->threshold,
         TraceLog::EVENT_FLAG_NONE);
   }
 }
 
 }  // namespace internal
 
 }  // namespace debug
 }  // namespace base