Removed resetting of pinch-gesture filter state on pinch end.

Removed resetting of pinch-gesture filter state on pinch end.

We used to reset the TouchActionFilter state |drop_pinch_gesture_events_|
at a pinch end assuming that there is a single pinch-sequence within a
gesture-scroll sequence. This logically correct assumption turned out to
be wrong in practice: a pinch-zoom-out-then-zoom-in actually sends two
consecutive pinch-begin/end sequences between a gesture-scroll-begin/end
sequence.

This CL defers the resetting of |drop_pinch_gesture_events_| to
bracketing gesture-scroll-end to avoid wrong filtering during the second
pinch-begin/end sequence.

BUG=662047
Review-Url: https://codereview.chromium.org/2526433003
Cr-Commit-Position: refs/heads/master@{#434248}
(cherry picked from commit b8dc459398704fe6df59e1be0655399085454449)

Committed: https://chromium.googlesource.com/chromium/src/+/b51fc4e484f4d46830b40122b04119e0edda708d

[mustaq, 2016-11-25 16:20:33]

Description was changed from

==========
Removed resetting of pinch-gesture filter state on pinch end.

We used to reset the TouchActionFilter state |drop_pinch_gesture_events_|
at a pinch end assuming that there is a single pinch-sequence within a
gesture-scroll sequence. This logically correct assumption turned out to
be wrong in practice: a pinch-zoom-out-then-zoom-in actually sends two
consecutive pinch-begin/end sequences between a gesture-scroll-begin/end
sequence.

This CL defers the resetting of |drop_pinch_gesture_events_| to
bracketing gesture-scroll-end to avoid wrong filtering during the second
pinch-begin/end sequence.

BUG=662047

Review-Url: https://codereview.chromium.org/2526433003
Cr-Commit-Position: refs/heads/master@{#434248}
(cherry picked from commit b8dc459398704fe6df59e1be0655399085454449)
==========

to

==========
Removed resetting of pinch-gesture filter state on pinch end.

We used to reset the TouchActionFilter state |drop_pinch_gesture_events_|
at a pinch end assuming that there is a single pinch-sequence within a
gesture-scroll sequence. This logically correct assumption turned out to
be wrong in practice: a pinch-zoom-out-then-zoom-in actually sends two
consecutive pinch-begin/end sequences between a gesture-scroll-begin/end
sequence.

This CL defers the resetting of |drop_pinch_gesture_events_| to
bracketing gesture-scroll-end to avoid wrong filtering during the second
pinch-begin/end sequence.

BUG=662047

Review-Url: https://codereview.chromium.org/2526433003
Cr-Commit-Position: refs/heads/master@{#434248}
(cherry picked from commit b8dc459398704fe6df59e1be0655399085454449)

Committed:
https://chromium.googlesource.com/chromium/src/+/b51fc4e484f4d46830b40122b041...
==========

[mustaq, 2016-11-25 16:20:34]

Committed patchset #1 (id:1) manually as
b51fc4e484f4d46830b40122b04119e0edda708d.