[Android] Don't hide text handles if they are being dragged

In webview, hiding of text handles can be triggered by many events
(containing view being scrolled, capturePicture call, etc.). If the
user is dragging a handle, we don't actually want to hide it. Instead,
explicitly suppress hiding of text handles while they are being dragged.

BUG=b/10723151

Review URL: https://codereview.chromium.org/26491010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228728 0039d316-1c4b-4281-b951-d872f2087c98
Fixed chrome-si/initializers sizes regression on Mac

r228160 introduced a regression in:
mac-releases/sizes/chrome-si/initializers

Fixed by using an inline function instead of a constant. Reverted
r228316, which incremented the perf expectation.

BUG=306729
NOTRY=true

Review URL: https://codereview.chromium.org/26890005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228729 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228728
SVN changes up to revision 228729