Blink Compositor Animation: Make Animation and Curve methods non-virtual.

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 1206 matching lines @@
       'inspector_protocol/ParserTest.cpp',
       'mac/VersionUtilMacTest.mm',
       'network/EncodedFormDataTest.cpp',
       'network/HTTPParsersTest.cpp',
       'network/LinkHeaderTest.cpp',
       'network/NetworkUtilsTest.cpp',
       'network/ResourceRequestTest.cpp',
       'scheduler/CancellableTaskFactoryTest.cpp',
       'scroll/ScrollableAreaTest.cpp',
       'testing/ArenaTestHelpers.h',
+      'testing/CompositorAnimationsTestUtils.h',
       'testing/TreeTestHelpers.cpp',
       'testing/TreeTestHelpers.h',
       'text/BidiResolverTest.cpp',
       'text/CharacterTest.cpp',
       'text/DateTimeFormatTest.cpp',
       'text/LocaleToScriptMappingTest.cpp',
       'text/HyphenationTest.cpp',
       'text/SegmentedStringTest.cpp',
       'text/TextBreakIteratorTest.cpp',
       'text/UnicodeUtilitiesTest.cpp',
@@ skipping 92 matching lines @@
       ['use_default_render_theme==1',
         {
           'platform_test_files': [
             'scroll/ScrollbarThemeAuraTest.cpp',
           ],
         }
       ],
     ],
   },
 }