GitLab

This adds a build step after generated_resources.h is generated. This step
parses generated_resources.h, extracting all the IDS_* names, index pairs and
produces a mapping from a hash of each name to its index.

This is the first step to implement a mechanism to allow us to override UI
strings with server provided strings from the variations_service.

Design doc for this feature: https://docs.google.com/a/google.com/document/d/1UCQCZzF0Ox9dyD3R66_Fn1RYfckF9BTVjM0o5u4YaWg/edit?usp=sharing

BUG=370033

Review URL: https://codereview.chromium.org/246123007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269880 0039d316-1c4b-4281-b951-d872f2087c98