Use RgbaColor in DesktopFrameGenerator and add RgbaColorTest

webrtc/modules/modules.gyp

 # Copyright (c) 2011 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.
 
 {
   'includes': [
@@ skipping 418 matching lines @@
                 'desktop_capture/differ_block_unittest.cc',
                 'desktop_capture/differ_unittest.cc',
               ],
             }],
             ['desktop_capture_supported==1', {
               'sources': [
                 'desktop_capture/desktop_and_cursor_composer_unittest.cc',
                 'desktop_capture/mouse_cursor_monitor_unittest.cc',
                 'desktop_capture/rgba_color.cc',
                 'desktop_capture/rgba_color.h',
+                'desktop_capture/rgba_color_unittest.cc',
                 'desktop_capture/screen_capturer_differ_wrapper_unittest.cc',
                 'desktop_capture/screen_capturer_helper_unittest.cc',
                 'desktop_capture/screen_capturer_mac_unittest.cc',
                 'desktop_capture/fake_desktop_capturer.h',
                 'desktop_capture/fake_screen_capturer.cc',
                 'desktop_capture/fake_screen_capturer.h',
                 'desktop_capture/desktop_frame_generator.cc',
                 'desktop_capture/desktop_frame_generator.h',
                 'desktop_capture/screen_capturer_mock_objects.h',
                 'desktop_capture/screen_capturer_unittest.cc',
@@ skipping 352 matching lines @@
               'sources': [
                 'modules_unittests.isolate',
               ],
             },
           ],
         }],
       ],
     }], # include_tests
   ], # conditions
 }