Using Enum in place of bool for better code readability

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 313 matching lines @@
       'exported/WebURLResponse.cpp',
       'exported/WebURLResponsePrivate.h',
       'exported/WrappedResourceRequest.h',
       'exported/WrappedResourceResponse.h',
       'exported/linux/WebFontInfo.cpp',
       'exported/linux/WebFontRenderStyle.cpp',
       'fonts/AlternateFontFamily.h',
       'fonts/Character.cpp',
       'fonts/Character.h',
       'fonts/CustomFontData.h',
+      'fonts/FixedPitchFontType.h',
       'fonts/Font.cpp',
       'fonts/Font.h',
       'fonts/FontBaseline.h',
       'fonts/FontCache.cpp',
       'fonts/FontCache.h',
       'fonts/FontCacheClient.h',
       'fonts/FontCacheKey.h',
       'fonts/FontCustomPlatformData.h',
       'fonts/FontData.cpp',
       'fonts/FontData.h',
@@ skipping 588 matching lines @@
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/OpaqueRectTrackingContentLayerDelegateTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }