Implement URLUtils and URL interface

Source/core/core.gypi

 {
     'variables': {
         'core_idl_files': [
             'css/CSS.idl',
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceLoadEvent.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSHostRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSKeyframeRule.idl',
@@ skipping 187 matching lines @@
             'html/HTMLVideoElement.idl',
             'html/ImageData.idl',
             'html/MediaController.idl',
             'html/MediaError.idl',
             'html/MediaKeyError.idl',
             'html/MediaKeyEvent.idl',
             'html/RadioNodeList.idl',
             'html/TextMetrics.idl',
             'html/TimeRanges.idl',
             'html/URL.idl',
+            'html/URLUtils.idl',
             'html/ValidityState.idl',
             'html/VoidCallback.idl',
             'html/canvas/ANGLEInstancedArrays.idl',
             'html/canvas/CanvasGradient.idl',
             'html/canvas/CanvasPattern.idl',
             'html/canvas/CanvasRenderingContext.idl',
             'html/canvas/CanvasRenderingContext2D.idl',
             'html/canvas/Canvas2DContextAttributes.idl',
             'html/canvas/EXTFragDepth.idl',
             'html/canvas/EXTTextureFilterAnisotropic.idl',
@@ skipping 1857 matching lines @@
             'events/WindowEventContext.cpp',
             'events/WindowEventContext.h',
         ],
         'webcore_html_files': [
             'html/ClassList.cpp',
             'html/ClassList.h',
             'html/DOMFormData.cpp',
             'html/DOMFormData.h',
             'html/DOMURL.cpp',
             'html/DOMURL.h',
+            'html/DOMURLUtils.cpp',
+            'html/DOMURLUtils.h',
             'html/FormAssociatedElement.cpp',
             'html/HTMLAllCollection.cpp',
             'html/HTMLAllCollection.h',
             'html/HTMLAnchorElement.cpp',
             'html/HTMLAnchorElement.h',
             'html/HTMLAppletElement.cpp',
             'html/HTMLAreaElement.cpp',
             'html/HTMLAreaElement.h',
             'html/HTMLAudioElement.cpp',
             'html/HTMLAudioElement.h',
@@ skipping 1562 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++"'
               }],
          ],
     }
 }