GitLab

Going to commit a fixed version soon.

> Telemetry: add a metadata layer between page set and .wpr.
> 
> The metadata file describes which pages in the page set are
> backed by which .wpr files. This allows us to update individual
> pages in the page set.
> 
> BUG=155660
> NOTRY=true
> 
> 
> Review URL: https://chromiumcodereview.appspot.com/11881051

TBR=marja@chromium.org
Review URL: https://codereview.chromium.org/12088107

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180131 0039d316-1c4b-4281-b951-d872f2087c98