[WebRTC] Add ScreenCapturerDifferWrapper to share Differ across ScreenCapturers

webrtc/modules/desktop_capture/desktop_capture.gypi

 # Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 {
   'targets': [
@@ skipping 83 matching lines @@
         'win/screen_capturer_win_directx.h',
         'win/screen_capturer_win_gdi.cc',
         'win/screen_capturer_win_gdi.h',
         'win/screen_capturer_win_magnifier.cc',
         'win/screen_capturer_win_magnifier.h',
         'win/window_capture_utils.cc',
         'win/window_capture_utils.h',
         'window_capturer.h',
         'window_capturer_mac.mm',
         'window_capturer_win.cc',
-
       ],
       'conditions': [
         ['OS!="ios" and (target_arch=="ia32" or target_arch=="x64")', {
           'dependencies': [
             'desktop_capture_differ_sse2',
           ],
         }],
         ['use_x11==1', {
           'sources': [
             'mouse_cursor_monitor_x11.cc',
@@ skipping 23 matching lines @@
             'screen_capturer_null.cc',
             'window_capturer_null.cc',
           ],
         }],
         ['OS!="ios" ', {
           'sources': [
             'differ.cc',
             'differ.h',
             'differ_block.cc',
             'differ_block.h',
+            'screen_capturer_differ_wrapper.cc',
+            'screen_capturer_differ_wrapper.h',
           ],
         }],
         ['OS=="mac"', {
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
               '$(SDKROOT)/System/Library/Frameworks/IOKit.framework',
               '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
             ],
           },
@@ skipping 17 matching lines @@
   ],  # targets
   'conditions': [
     ['OS!="ios" and (target_arch=="ia32" or target_arch=="x64")', {
       'targets': [
         {
           # Have to be compiled as a separate target because it needs to be
           # compiled with SSE2 enabled.
           'target_name': 'desktop_capture_differ_sse2',
           'type': 'static_library',
           'sources': [
-            'differ_block_sse2.cc',
-            'differ_block_sse2.h',
+            'differ_vector_sse2.cc',
+            'differ_vector_sse2.h',
           ],
           'conditions': [
             ['os_posix==1', {
               'cflags': [ '-msse2', ],
               'xcode_settings': {
                 'OTHER_CFLAGS': [ '-msse2', ],
               },
             }],
           ],
         },
       ],  # targets
     }],
   ],
 }