Add new image resource for touch friendly hide keyboard key.

BUG=349091

Review URL: https://codereview.chromium.org/186153004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255054 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255054
Fix PSS unit tests

BUG=347447

Review URL: https://codereview.chromium.org/184053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255055 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255055