Followup for bug when zipping a folder with non-ascii chars in its name.

The commit adds a unit test and replaces the substr with the more
stylistically adequate FilePath::AppendRelativePath.

BUG=248115
TEST=ZipTest.ZipNonASCIIDir

Review URL: https://codereview.chromium.org/106663006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239474 0039d316-1c4b-4281-b951-d872f2087c98
Pass "can_dock" parameter to DevTools frontend.

BUG=326515

Review URL: https://codereview.chromium.org/108373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239475 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239475