drive: Make FileCache::RenameCacheFilesToNewFormat responsible to canonicalize file name

Move file name canonicalization responsibility from CanonicalizeIDs to RenameCacheFilesToNewFormat

CanonicalizeIDs will be deleted soon when cache entry ID canonicalization code moves to ResourceMetadataStorage.

BUG=309597
TEST=unit_tests
R=kinaba@chromium.org

Review URL: https://codereview.chromium.org/32333002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230029 0039d316-1c4b-4281-b951-d872f2087c98
Allow small pixel differences in tab capture tests with software.

The software readback path can cause small pixel differences, so ignore them.

BUG=306789

Review URL: https://codereview.chromium.org/27372006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230030 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230030