drive: Stop using resource ID to access local metadata from ChangeListProcessor

Add a new member parent_resource_id_map_ to ChangeListProcessor.
Rewrite ApplyEntryMap() and ApplyEntry().

BUG=275270
TEST=unit_tests

Review URL: https://codereview.chromium.org/25430004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@227547 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 227547