Merge commit 'aecb8a007cd815a4aaa5a1bc56b49a8e3a699334' * commit 'aecb8a007cd815a4aaa5a1bc56b49a8e3a699334': Reset mPreventDrag at touch_down.
Merge commit 'aecb8a007cd815a4aaa5a1bc56b49a8e3a699334' * commit 'aecb8a007cd815a4aaa5a1bc56b49a8e3a699334': Reset mPreventDrag at touch_down.