Show handles when marking text with touch in NativeTextfieldViews

In NativeTextfieldViews, part of text can be selected using touch
scrubbing. After touch scrubbing is finished, touch editing handles
should appear to allow more touch selection manipulation.

BUG=239111

Review URL: https://codereview.chromium.org/93433003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238444 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238444
Move directory creation functions to base namespace.

BUG=

Review URL: https://codereview.chromium.org/100573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238446 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 238446