Refactor BlockDifference() to use MediaInitializer().

media/base/media.cc

 // Copyright 2013 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.
 
 #include "media/base/media.h"
 
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/path_service.h"
 #include "base/synchronization/lock.h"
 #include "build/build_config.h"
 #include "media/base/sinc_resampler.h"
 #include "media/base/vector_math.h"
 #include "media/base/yuv_convert.h"
+#include "media/video/capture/screen/differ_block.h"
 
 namespace media {
 
 namespace internal {
 // Platform specific initialization method.
 extern bool InitializeMediaLibraryInternal(const base::FilePath& module_dir);
 }  // namespace internal
 
 // Media must only be initialized once, so use a LazyInstance to ensure this.
 class MediaInitializer {
@@ skipping 18 matching lines @@
   MediaInitializer()
       : initialized_(false),
         tried_initialize_(false) {
     // Perform initialization of libraries which require runtime CPU detection.
     // TODO(dalecurtis): Add initialization of YUV, SincResampler.
     vector_math::Initialize();
 #if !defined(OS_IOS)
     SincResampler::InitializeCPUSpecificFeatures();
     InitializeCPUSpecificYUVConversions();
 #endif
+#if defined(SCREEN_CAPTURE_SUPPORTED)
+    InitializeCPUSpecificBlockDifference();
+#endif
   }
 
   ~MediaInitializer() {
     NOTREACHED() << "MediaInitializer should be leaky!";
   }
 
   base::Lock lock_;
   bool initialized_;
   bool tried_initialize_;
 
@@ skipping 16 matching lines @@
 bool IsMediaLibraryInitialized() {
   return g_media_library.Get().IsInitialized();
 }
 
 void InitializeCPUSpecificMediaFeatures() {
   // Force initialization of the media initializer, but don't call Initialize().
   g_media_library.Get();
 }
 
 }  // namespace media