Add unit test for GlyphPageTreeNode.

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 288 matching lines @@
           ['include', 'CF\\.cpp$'],
 
           # Use native Mac font code from core.
           ['include', '(fonts/)?mac/[^/]*Font[^/]*\\.(cpp|mm?)$'],
           ['include', 'fonts/mac/ComplexText[^/]*\\.(cpp|h)$'],
 
           # Cherry-pick some files that can't be included by broader regexps.
           # Some of these are used instead of Chromium platform files, see
           # the specific exclusions in the "exclude" list below.
           ['include', 'audio/mac/FFTFrameMac\\.cpp$'],
-          ['include', 'fonts/mac/GlyphPageTreeNodeMac\\.cpp$'],
           ['include', 'fonts/mac/ComplexTextControllerCoreText\\.mm$'],
           ['include', 'mac/ColorMac\\.mm$'],
           ['include', 'mac/BlockExceptions\\.mm$'],
           ['include', 'mac/KillRingMac\\.mm$'],
           ['include', 'mac/LocalCurrentGraphicsContext\\.mm$'],
           ['include', 'mac/NSScrollerImpDetails\\.mm$'],
           ['include', 'mac/ScrollAnimatorMac\\.mm$'],
           ['include', 'mac/ScrollElasticityController\\.mm$'],
           ['include', 'mac/ThemeMac\\.h$'],
           ['include', 'mac/ThemeMac\\.mm$'],
  
           # Mac uses only ScrollAnimatorMac.
           ['exclude', 'scroll/ScrollbarThemeNonMacCommon\\.(cpp|h)$'],
           ['exclude', 'scroll/ScrollAnimatorNone\\.cpp$'],
           ['exclude', 'scroll/ScrollAnimatorNone\\.h$'],
 
           # The Mac currently uses FontCustomPlatformDataMac.cpp,
           # included by regex above, instead.
           ['exclude', 'fonts/skia/FontCustomPlatformDataSkia\\.cpp$'],
 
           ['exclude', 'fonts/skia/FontCacheSkia\\.cpp$'],
-          ['exclude', 'fonts/skia/GlyphPageTreeNodeSkia\\.cpp$'],
           ['exclude', 'fonts/skia/SimpleFontDataSkia\\.cpp$'],
 
           # Mac uses Harfbuzz.
           ['include', 'fonts/harfbuzz/HarfBuzzFaceCoreText\\.cpp$'],
           ['include', 'fonts/harfbuzz/HarfBuzzFace\\.(cpp|h)$'],
           ['include', 'fonts/harfbuzz/HarfBuzzShaper\\.(cpp|h)$'],
 
           ['include', 'geometry/mac/FloatPointMac\\.mm$'],
           ['include', 'geometry/mac/FloatRectMac\\.mm$'],
           ['include', 'geometry/mac/FloatSizeMac\\.mm$'],
@@ skipping 32 matching lines @@
         'sources/': [
           # We use LocaleWin.cpp instead of LocaleICU.cpp
           ['exclude', 'text/LocaleICU\\.(cpp|h)$'],
           ['include', 'text/LocaleWin\\.(cpp|h)$'],
 
           ['include', 'clipboard/ClipboardUtilitiesWin\\.(cpp|h)$'],
 
           ['include', 'fonts/opentype/'],
           ['include', 'fonts/skia/FontCustomPlatformDataSkia\\.cpp$'],
           ['include', 'fonts/skia/FontCustomPlatformDataSkia\\.cpp$'],
-          ['include', 'fonts/skia/GlyphPageTreeNodeSkia\\.cpp$'],
           ['include', 'fonts/skia/SimpleFontDataSkia\\.cpp$'],
           ['include', 'fonts/win/FontCacheSkiaWin\\.cpp$'],
           ['include', 'fonts/win/FontFallbackWin\\.(cpp|h)$'],
           ['include', 'fonts/win/FontPlatformDataWin\\.cpp$'],
 
           # SystemInfo.cpp is useful and we don't want to copy it.
           ['include', 'win/SystemInfo\\.cpp$'],
         ],
       }, { # OS!="win"
         'sources/': [
@@ skipping 85 matching lines @@
           ['OS=="android"', {
             'cflags!': ['-mthumb'],
           }],
         ],
       },{  # target_arch!="arm"
         'type': 'none',
       }],
     ],
   }],
 }