SVG appears to be built without some of the SVG filters. Not sure why. So I thought 'd change the .gyp to include them, specifically this:
U:\chromium\src\third_party\WebKit\WebCore\WebCore.gyp\WebCore.gyp(481): # Extra SVG bindings to exclude.
What do I now to rebuild the VCPROJ files? Do I rerun the main CEF batch file?
Answer: gclient runhooks in the folder with modified .gyp