Add additional debug/check for ScopedCOMInitializer.

base/win/scoped_com_initializer.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_WIN_SCOPED_COM_INITIALIZER_H_
 #define BASE_WIN_SCOPED_COM_INITIALIZER_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "build/build_config.h"
@@ skipping 32 matching lines @@
   }
 
   bool succeeded() const { return SUCCEEDED(hr_); }
 
  private:
   void Initialize(COINIT init) {
 #ifndef NDEBUG
     thread_id_ = GetCurrentThreadId();
 #endif
     hr_ = CoInitializeEx(NULL, init);
+#ifndef NDEBUG
+    switch (hr_) {
+      case S_FALSE:
+        LOG(ERROR) << "Multiple CoInitialize() called for thread "
+                   << thread_id_;
+        break;
+      case RPC_E_CHANGED_MODE:
+        DCHECK(false) << "Invalid COM thread model change";
+        break;
+      default:
+        break;
+    }
+#endif
   }
 
   HRESULT hr_;
 #ifndef NDEBUG
   // In debug builds we use this variable to catch a potential bug where a
   // ScopedCOMInitializer instance is deleted on a different thread than it
   // was initially created on.  If that ever happens it can have bad
   // consequences and the cause can be tricky to track down.
   DWORD thread_id_;
 #endif
@@ skipping 22 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedCOMInitializer);
 };
 
 }  // namespace win
 }  // namespace base
 
 #endif
 
 #endif  // BASE_WIN_SCOPED_COM_INITIALIZER_H_