GitLab

Add a service to request & cache images for Answers in Suggest.

This service allows the UI thread to request images that are fetched
via http(s) and then decoded in a render process, caching the most
recent images to avoid repeated network requests.

BUG=380916

Review URL: https://codereview.chromium.org/319623003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278311 0039d316-1c4b-4281-b951-d872f2087c98