DevTools: add correct include dirs to protocol handler generator for V8.

Jinja2 and markupsafe will be pulled into v8/third_party/ via DEPS,
while the protocol handler generator will be pulled into
v8/platform/inspector_protocol/. In order for the protocol handler
generator to work when building standalone V8, it needs to include
them correctly.

R=pfeldman@chromium.org
BUG=580337

Review-Url: https://codereview.chromium.org/2174773002
Cr-Original-Commit-Position: refs/heads/master@{#407582}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 322f425f3406a70a1513d53c35bf55bd5c3b2165
1 file changed