Adds chromecast/tools/build to gyp_chromium paths for pymod_do_main.

This allows for Chromecast's locale repack script (based off the
implementation in chrome/) to specificy Chromecast-specific files.

R=lcwu@chromium.org
BUG=403104

Review URL: https://codereview.chromium.org/466133003

Cr-Commit-Position: refs/heads/master@{#289699}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289699 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed