Rename Animation -> PrimitiveAnimation

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
@@ skipping 2518 matching lines @@
             'platform/Sound.h',
             'platform/SuddenTermination.h',
             'platform/Theme.cpp',
             'platform/ThreadGlobalData.cpp',
             'platform/ThreadTimers.cpp',
             'platform/ThreadTimers.h',
             'platform/Timer.cpp',
             'platform/UUID.cpp',
             'platform/UUID.h',
             'platform/Widget.cpp',
-            'platform/animation/Animation.cpp',
+            'platform/animation/PrimitiveAnimation.cpp',
             'platform/animation/AnimationList.cpp',
             'platform/audio/AudioArray.h',
             'platform/audio/AudioBus.cpp',
             'platform/audio/AudioBus.h',
             'platform/audio/AudioChannel.cpp',
             'platform/audio/AudioChannel.h',
             'platform/audio/AudioDSPKernel.h',
             'platform/audio/AudioDSPKernelProcessor.cpp',
             'platform/audio/AudioDSPKernelProcessor.h',
             'platform/audio/AudioDestination.h',
@@ skipping 1179 matching lines @@
                 'bison_exe': 'bison',
                 # We specify a preprocess so it happens locally and won't get
                 # distributed to goma.
                 # FIXME: /usr/bin/gcc won't exist on OSX forever. We want to
                 # use /usr/bin/clang once we require Xcode 4.x.
                 'preprocessor': '--preprocessor "/usr/bin/gcc -E -P -x c++"'
               }],
          ],
     }
 }