Fix DirectX diagnostic collection for about:gpu page.

content/gpu/gpu_dx_diagnostics_win.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.
 //
 // Functions to enumerate the Dx Diagnostic Tool hierarchy and build up
 // a tree of nodes with name / value properties.
 
 #define INITGUID
 #include <dxdiag.h>
 #include <windows.h>
 
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
+#include "base/win/scoped_com_initializer.h"
 #include "content/gpu/gpu_info_collector.h"
 
 // Functions in this file depend on functions exported from dxguid.dll.
 #pragma comment(lib, "dxguid.lib")
 
 namespace {
 
 // Traverses the IDxDiagContainer tree and populates a tree of DxDiagNode
 // structures that contains property name / value pairs and subtrees of DirectX
 // diagnostic information.
@@ skipping 66 matching lines @@
     }
   }
 }
 }  // namespace anonymous
 
 namespace gpu_info_collector {
 
 bool GetDxDiagnostics(content::DxDiagNode* output) {
   HRESULT hr;
   bool success = false;
+  base::win::ScopedCOMInitializer com_initializer;
 
   IDxDiagProvider* provider = NULL;
   hr = CoCreateInstance(CLSID_DxDiagProvider,
                          NULL,
                          CLSCTX_INPROC_SERVER,
                          IID_IDxDiagProvider,
                          reinterpret_cast<void**>(&provider));
   if (SUCCEEDED(hr)) {
     DXDIAG_INIT_PARAMS params = { sizeof(params) };
     params.dwDxDiagHeaderVersion = DXDIAG_DX9_SDK_VERSION;
@@ skipping 18 matching lines @@
 
         root->Release();
       }
     }
     provider->Release();
   }
 
   return success;
 }
 }  // namespace gpu_info_collector