[Android] Force showing insertion handle when paste popup activated
An unhandled context menu may result in the showing of the paste popup. However,
this paste popup notification is not well-ordered with respect to other
notifications that determine insertion handle state, namely, position and
region editability updates. Consequently, the paste popup may be shown without
a corresponding insertion handle. Resolve this by forcing an editability and
position update when the paste popup notification is received.
BUG=400304,400330,396997
Review URL: https://codereview.chromium.org/
447493002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287845 0039d316-1c4b-4281-b951-d872f2087c98