Register v8/v8 in gclient for trying Gerrit v8 patches on chromium trybots.

R=machenbach@chromium.org
BUG=685318

Change-Id: I61192392eec98ad6b9a32ef933f2d22cf2aedd0e
Reviewed-on: https://chromium-review.googlesource.com/435318
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>

recipe_modules/gclient/config.py

@@ -143,6 +143,7 @@ def chromium_bare(c):
   p['pdfium'] = ('src/third_party/pdfium', 'HEAD')
   p['skia'] = ('src/third_party/skia', 'HEAD')
   p['v8'] = ('src/v8', 'HEAD')
+  p['v8/v8'] = ('src/v8', 'HEAD')
   p['webrtc'] = ('src/third_party/webrtc', 'HEAD')
 
 @config_ctx(includes=['chromium_bare'])