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By this patch, a search result entry whose metadata is not fetched yet is
temporarily added to the hidden "drive/other" directory for making it possible
to appear in the search result UI. Normal feed loading routine will move it
back to the right place once the real metadata is loaded.

BUG=181075
TEST=Search "a" during the initial load of an account with large number of files
R=hashimoto@chromium.org

Review URL: https://codereview.chromium.org/16142003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203091 0039d316-1c4b-4281-b951-d872f2087c98