Bring the Mac Chromium render theme up to date and easier to keep merged. DO ...

WebCore.gypi

 {
     'variables': {
         'webcore_files': [
 
             #IDL files
             'css/CSSCharsetRule.idl',
             'css/CSSFontFaceRule.idl',
             'css/CSSImportRule.idl',
             'css/CSSMediaRule.idl',
             'css/CSSPageRule.idl',
@@ skipping 1755 matching lines @@
             'platform/chromium/ScrollbarThemeChromium.h',
             'platform/chromium/ScrollbarThemeChromiumLinux.cpp',
             'platform/chromium/ScrollbarThemeChromiumWin.cpp',
             'platform/chromium/SearchPopupMenuChromium.cpp',
             'platform/chromium/SharedTimerChromium.cpp',
             'platform/chromium/SoundChromiumPosix.cpp',
             'platform/chromium/SoundChromiumWin.cpp',
             'platform/chromium/SuddenTerminationChromium.cpp',
             'platform/chromium/SystemTimeChromium.cpp',
             'platform/chromium/TemporaryLinkStubs.cpp',
+            'platform/chromium/ThemeChromiumMac.h',
+            'platform/chromium/ThemeChromiumMac.mm',
             'platform/chromium/WidgetChromium.cpp',
             'platform/chromium/WindowsVersion.cpp',
             'platform/chromium/WindowsVersion.h',
             'platform/graphics/cairo/CairoPath.h',
             'platform/graphics/cairo/FontCairo.cpp',
             'platform/graphics/cairo/GradientCairo.cpp',
             'platform/graphics/cairo/GraphicsContextCairo.cpp',
             'platform/graphics/cairo/GraphicsContextPlatformPrivateCairo.h',
             'platform/graphics/cairo/ImageBufferCairo.cpp',
             'platform/graphics/cairo/ImageBufferData.h',
@@ skipping 1853 matching lines @@
             'inspector/front-end/Images/undockButtonGlyph.png',
             'inspector/front-end/Images/userInputIcon.png',
             'inspector/front-end/Images/userInputPreviousIcon.png',
             'inspector/front-end/Images/userInputResultIcon.png',
             'inspector/front-end/Images/warningIcon.png',
             'inspector/front-end/Images/warningMediumIcon.png',
             'inspector/front-end/Images/warningsErrors.png',
         ],
     }
 }