Add animation support for WebP images

Source/WebKit/chromium/WebKit.gyp

 #
 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #         * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 354 matching lines @@
                 ['component=="shared_library"', {
                     'dependencies': [
                         '../../core/core.gyp:webcore_derived',
                         '../../core/core.gyp:webcore_test_support',
                         '<(DEPTH)/base/base.gyp:test_support_base',
                         '<(DEPTH)/testing/gmock.gyp:gmock',
                         '<(DEPTH)/testing/gtest.gyp:gtest',
                         '<(DEPTH)/third_party/icu/icu.gyp:*',
                         '<(DEPTH)/third_party/libjpeg_turbo/libjpeg.gyp:libjpeg',
                         '<(DEPTH)/third_party/libpng/libpng.gyp:libpng',
+                        '<(DEPTH)/third_party/libwebp/libwebp.gyp:libwebp',
                         '<(DEPTH)/third_party/libxml/libxml.gyp:libxml',
                         '<(DEPTH)/third_party/libxslt/libxslt.gyp:libxslt',
                         '<(DEPTH)/third_party/modp_b64/modp_b64.gyp:modp_b64',
                         '<(DEPTH)/third_party/ots/ots.gyp:ots',
                         '<(DEPTH)/third_party/zlib/zlib.gyp:zlib',
                         '<(DEPTH)/url/url.gyp:url_lib',
                         '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
                         # We must not add webkit_support here because of cyclic dependency.
                     ],
                     'export_dependent_settings': [
@@ skipping 205 matching lines @@
         ['clang==1', {
             'target_defaults': {
                 'cflags': ['-Wglobal-constructors'],
                 'xcode_settings': {
                     'WARNING_CFLAGS': ['-Wglobal-constructors'],
                 },
             },
         }],
     ], # conditions
 }