DevTools: Parallelize trace messages serialization.

net/base/trace_net_log_observer_unittest.cc

Index: net/base/trace_net_log_observer_unittest.cc
diff --git a/net/base/trace_net_log_observer_unittest.cc b/net/base/trace_net_log_observer_unittest.cc
index 5256bac9c8a2fb9c92b80ea50dda3c7cc4625d51..9c75d7d16a7e290705e90e04a279e9f7d4d61c5d 100644
--- a/net/base/trace_net_log_observer_unittest.cc
+++ b/net/base/trace_net_log_observer_unittest.cc
@@ -85,7 +85,7 @@ class TraceNetLogObserverTest : public testing::Test {
     trace_events_ = FilterNetLogTraceEvents(*trace_events);
 
     if (!has_more_events)
-      run_loop->Quit();
+      message_loop_proxy_->PostTask(FROM_HERE, run_loop->QuitClosure());
   }
 
   static void EnableTraceLog() {
@@ -98,6 +98,7 @@ class TraceNetLogObserverTest : public testing::Test {
   void EndTraceAndFlush() {
     base::RunLoop run_loop;
     TraceLog::GetInstance()->SetDisabled();
+    message_loop_proxy_ = base::MessageLoopProxy::current();
     TraceLog::GetInstance()->Flush(
         base::Bind(&TraceNetLogObserverTest::OnTraceDataCollected,
                    base::Unretained(this),
@@ -149,6 +150,7 @@ class TraceNetLogObserverTest : public testing::Test {
   base::debug::TraceResultBuffer::SimpleOutput json_output_;
   CapturingNetLog net_log_;
   scoped_ptr<TraceNetLogObserver> trace_net_log_observer_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 };
 
 TEST_F(TraceNetLogObserverTest, TracingNotEnabled) {