Move keyboard related files from core/ to platform.

Source/platform/blink_platform.gyp

 #
 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 105 matching lines @@
           ['exclude', 'Posix\\.cpp$'],
           # We use LocaleWin.cpp instead of LocaleICU.cpp
           ['exclude', 'LocaleICU\\.(cpp|h)$'],
         ],
       }, { # OS!="win"
         'sources/': [
           ['exclude', 'win/'],
           ['exclude', 'Win\\.cpp$'],
         ],
       }],
+      ['toolkit_uses_gtk == 0', {
+        'sources/': [
+          ['exclude', 'Gtk\\.cpp$'],
+        ],
+      }],
+      ['OS!="android"', {
+        'sources/': [
+          ['exclude', 'Android\\.cpp$'],
+        ],
+      }],
       ['"WTF_USE_WEBAUDIO_FFMPEG=1" in feature_defines', {
         'include_dirs': [
           '<(DEPTH)/third_party/ffmpeg',
         ],
         'dependencies': [
           '<(DEPTH)/third_party/ffmpeg/ffmpeg.gyp:ffmpeg',
         ],
       }],
       ['"WTF_USE_WEBAUDIO_OPENMAX_DL_FFT=1" in feature_defines', {
          'include_dirs': [
            '<(DEPTH)/third_party/openmax_dl',
          ],
         'dependencies': [
           '<(DEPTH)/third_party/openmax_dl/dl/dl.gyp:openmax_dl',
         ],
       }],
     ],
   }],
 }