Implement FloatRect::squaredDistanceTo function

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 999 matching lines @@
       'fonts/mac/FontFamilyMatcherMacTest.mm',
       'fonts/opentype/OpenTypeVerticalDataTest.cpp',
       'fonts/shaping/CachingWordShaperTest.cpp',
       'fonts/shaping/HarfBuzzShaperTest.cpp',
       'fonts/shaping/RunSegmenterTest.cpp',
       'fonts/win/FontFallbackWinTest.cpp',
       'geometry/FloatBoxTest.cpp',
       'geometry/FloatBoxTestHelpers.cpp',
       'geometry/FloatPointTest.cpp',
       'geometry/FloatPolygonTest.cpp',
+      'geometry/FloatRectTest.cpp',
       'geometry/FloatRoundedRectTest.cpp',
       'geometry/FloatSizeTest.cpp',
       'geometry/GeometryTestHelpers.cpp',
       'geometry/LayoutRectOutsetsTest.cpp',
       'geometry/RegionTest.cpp',
       'graphics/ContiguousContainerTest.cpp',
       'graphics/GraphicsContextTest.cpp',
       'graphics/RecordingImageBufferSurfaceTest.cpp',
       'graphics/ThreadSafeDataTransportTest.cpp',
       'graphics/filters/FilterOperationsTest.cpp',
@@ skipping 96 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }