Optimize Complex Text Shaping and Caching

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 374 matching lines @@
       'fonts/Latin1TextIterator.h',
       'fonts/UTF16TextIterator.cpp',
       'fonts/UTF16TextIterator.h',
       'fonts/SegmentedFontData.cpp',
       'fonts/SegmentedFontData.h',
       'fonts/SimpleFontData.cpp',
       'fonts/SimpleFontData.h',
       'fonts/TextBlob.h',
       'fonts/VDMXParser.cpp',
       'fonts/VDMXParser.h',
-      'fonts/WidthCache.h',
       'fonts/android/FontCacheAndroid.cpp',
       'fonts/linux/FontCacheLinux.cpp',
       'fonts/linux/FontPlatformDataLinux.cpp',
       'fonts/mac/FontFamilyMatcherMac.h',
       'fonts/mac/FontFamilyMatcherMac.mm',
       'fonts/mac/FontCacheMac.mm',
       'fonts/mac/FontPlatformDataMac.mm',
       'fonts/opentype/OpenTypeSanitizer.cpp',
       'fonts/opentype/OpenTypeSanitizer.h',
       'fonts/opentype/OpenTypeTypes.h',
       'fonts/opentype/OpenTypeVerticalData.cpp',
       'fonts/opentype/OpenTypeVerticalData.h',
+      'fonts/shaping/CachingWordShapeIterator.h',
+      'fonts/shaping/CachingWordShaper.cpp',
+      'fonts/shaping/CachingWordShaper.h',
       'fonts/shaping/HarfBuzzFace.cpp',
       'fonts/shaping/HarfBuzzFace.h',
       'fonts/shaping/HarfBuzzShaper.cpp',
       'fonts/shaping/HarfBuzzShaper.h',
       'fonts/shaping/Shaper.cpp',
       'fonts/shaping/Shaper.h',
       'fonts/shaping/SimpleShaper.cpp',
       'fonts/shaping/SimpleShaper.h',
+      'fonts/shaping/ShapeCache.h',
       'fonts/skia/FontCacheSkia.cpp',
       'fonts/win/FontCacheSkiaWin.cpp',
       'fonts/win/FontFallbackWin.cpp',
       'fonts/win/FontFallbackWin.h',
       'fonts/win/FontPlatformDataWin.cpp',
       'geometry/DoublePoint.cpp',
       'geometry/DoublePoint.h',
       'geometry/DoubleRect.cpp',
       'geometry/DoubleRect.h',
       'geometry/DoubleSize.cpp',
@@ skipping 514 matching lines @@
       'WebVectorTest.cpp',
       'animation/TimingFunctionTest.cpp',
       'animation/UnitBezierTest.cpp',
       'clipboard/ClipboardUtilitiesTest.cpp',
       'fonts/FontCacheTest.cpp',
       'fonts/FontDescriptionTest.cpp',
       'fonts/FontTest.cpp',
       'fonts/GlyphBufferTest.cpp',
       'fonts/GlyphPageTreeNodeTest.cpp',
       'fonts/android/FontCacheAndroidTest.cpp',
+      'fonts/shaping/CachingWordShaperTest.cpp',
       'fonts/shaping/HarfBuzzShaperTest.cpp',
       'geometry/FloatBoxTest.cpp',
       'geometry/FloatBoxTestHelpers.cpp',
       'geometry/FloatPointTest.cpp',
       'geometry/FloatPolygonTest.cpp',
       'geometry/FloatRoundedRectTest.cpp',
       'geometry/FloatSizeTest.cpp',
       'geometry/GeometryTestHelpers.cpp',
       'geometry/LayoutRectOutsetsTest.cpp',
       'geometry/RegionTest.cpp',
@@ skipping 72 matching lines @@
       ['os_posix==1 and OS!="mac"',
         {
           'platform_test_files': [
             'text/LocaleICUTest.cpp',
           ],
         }
       ],
     ],
   },
 }