Add a command line flag for dumping trace events to VLOG

cc/test/cc_test_suite.cc

Index: cc/test/cc_test_suite.cc
diff --git a/cc/test/cc_test_suite.cc b/cc/test/cc_test_suite.cc
index c9d48b7ee763eec975799c24298ffc99e5d56418..58b8d06b5119d611d5ef52577395e686e644fefb 100644
--- a/cc/test/cc_test_suite.cc
+++ b/cc/test/cc_test_suite.cc
@@ -4,7 +4,11 @@
 
 #include "cc/test/cc_test_suite.h"
 
+#include "base/command_line.h"
+#include "base/debug/trace_event_impl.h"
 #include "base/message_loop.h"
+#include "base/threading/thread_id_name_manager.h"
+#include "cc/base/switches.h"
 #include "cc/test/paths.h"
 
 namespace cc {
@@ -17,7 +21,24 @@ CCTestSuite::~CCTestSuite() {}
 void CCTestSuite::Initialize() {
   base::TestSuite::Initialize();
   RegisterPathProvider();
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+        switches::kCCUnittestsTraceEventsToStderr)) {
+    base::debug::TraceLog::Options options =
+        static_cast<base::debug::TraceLog::Options>(
+            base::debug::TraceLog::ECHO_TO_STDERR |
+            base::debug::TraceLog::RECORD_CONTINUOUSLY);

[nduca, 2013/04/25 02:32:35]

not sure i get this bit. Why not turn on a non-recording tracelog in this case?

+
+    base::debug::TraceLog::GetInstance()->SetEnabled(
+        base::debug::CategoryFilter("cc"),
+        options);
+  }
+
   message_loop_.reset(new MessageLoop);
+
+  base::ThreadIdNameManager::GetInstance()->SetName(
+      base::PlatformThread::CurrentId(),
+      "Main");
 }
 
 void CCTestSuite::Shutdown() {