Add DesktopCapturer GetSourceList SelectSource FocusOnSelectedSource functions

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 21 matching lines @@
       'sources': [
         'cropped_desktop_frame.cc',
         'cropped_desktop_frame.h',
         'cropping_window_capturer.cc',
         'cropping_window_capturer.h',
         'cropping_window_capturer_win.cc',
         'desktop_and_cursor_composer.cc',
         'desktop_and_cursor_composer.h',
         'desktop_capture_options.h',
         'desktop_capture_options.cc',
+        'desktop_capturer.cc',
         'desktop_capturer.h',
         'desktop_frame_win.cc',
         'desktop_frame_win.h',
         'mac/desktop_configuration.h',
         'mac/desktop_configuration.mm',
         'mac/desktop_configuration_monitor.h',
         'mac/desktop_configuration_monitor.cc',
         'mac/full_screen_chrome_window_detector.cc',
         'mac/full_screen_chrome_window_detector.h',
         'mac/scoped_pixel_buffer_object.cc',
@@ skipping 138 matching lines @@
               'xcode_settings': {
                 'OTHER_CFLAGS': [ '-msse2', ],
               },
             }],
           ],
         },
       ],  # targets
     }],
   ],
 }