Make sure the thread calling CoCreateGuid is CoInitialized.

base/win/event_trace_controller_unittest.cc

Index: base/win/event_trace_controller_unittest.cc
diff --git a/base/win/event_trace_controller_unittest.cc b/base/win/event_trace_controller_unittest.cc
index 2e3a403acf0b1eab6c33b29cb46c57c95c1569f5..223791c1c803a9d6f6f23cf4668e5185e2998df1 100644
--- a/base/win/event_trace_controller_unittest.cc
+++ b/base/win/event_trace_controller_unittest.cc
@@ -17,6 +17,7 @@
 #include "base/win/event_trace_controller.h"
 #include "base/win/event_trace_provider.h"
 #include "base/win/scoped_handle.h"
+#include "base/win/scoped_com_initializer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ -128,6 +129,7 @@ class EtwTraceControllerTest : public testing::Test {
   }
 
  protected:
+  base::win::ScopedCOMInitializer com_initializer_;
   GUID test_provider_;
   std::wstring session_name_;
 };