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Will fetch server thumbnails if they are available. Using the BitmapFetcher to obtain and decode images.

I've tested with a subsequent CL that modifies suggestions_source.cc.

Next CLs will implement local caching once the image is fetched.

BUG=None
TEST=ThumbnailManagerTest,ThumbnailManagerBrowserTest

Review URL: https://codereview.chromium.org/299713007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273012 0039d316-1c4b-4281-b951-d872f2087c98