Add new WebKit directory to paths searched by gyp.

BUG=none
TEST=none
TBR=dglazkov


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25622 0039d316-1c4b-4281-b951-d872f2087c98

webkit/webkit.gyp

@@ -71,6 +71,7 @@
       '../third_party/WebKit/WebCore/platform/image-decoders/skia',
       '../third_party/WebKit/WebCore/platform/image-decoders/xbm',
       '../third_party/WebKit/WebCore/platform/image-encoders/skia',
+      '../third_party/WebKit/WebCore/platform/mock',
       '../third_party/WebKit/WebCore/platform/network',
       '../third_party/WebKit/WebCore/platform/network/chromium',
       '../third_party/WebKit/WebCore/platform/sql',