Based on Evan's patch from
http://codereview.chromium.org/522020/show
This adds various fixes for making all targets build with Clang.
1) Patch this in
2) Apply included patches:
$ patch -d third_party/lss -p0 < lss.patch
3) source llvm.sh (make sure the paths in there are correct)
4) build/gyp_chromium
5) make
(Built all of Chromium r62522 with Clang r116473 in debug and release modes.)