Trackpad scrolling could lag on MacOSX

Trackpad scrolling could lag on MacOSX

Mouse wheel gesture scrolling with synthetic begin and ends
could saturate the gesture event queue. Ensure that
a synthetic gesture begin coalesces with a synthetic
gesture end so that the updates end up coalescing as well.
This prevents laggy scrolling on MacOSX when it takes
a long time per frame to scroll.

BUG=607340
Review-Url: https://codereview.chromium.org/1932363002
Cr-Commit-Position: refs/heads/master@{#390942}
(cherry picked from commit dcd46c08887b38add468d81bf3b5bf4910d0f248)

Committed: https://chromium.googlesource.com/chromium/src/+/84fdd1d3433ee491096cddea636f45491779483e

[dtapuska, 2016-05-04 13:01:05]

Description was changed from

==========
Trackpad scrolling could lag on MacOSX

Mouse wheel gesture scrolling with synthetic begin and ends
could saturate the gesture event queue. Ensure that
a synthetic gesture begin coalesces with a synthetic
gesture end so that the updates end up coalescing as well.
This prevents laggy scrolling on MacOSX when it takes
a long time per frame to scroll.

BUG=607340

Review-Url: https://codereview.chromium.org/1932363002
Cr-Commit-Position: refs/heads/master@{#390942}
(cherry picked from commit dcd46c08887b38add468d81bf3b5bf4910d0f248)
==========

to

==========
Trackpad scrolling could lag on MacOSX

Mouse wheel gesture scrolling with synthetic begin and ends
could saturate the gesture event queue. Ensure that
a synthetic gesture begin coalesces with a synthetic
gesture end so that the updates end up coalescing as well.
This prevents laggy scrolling on MacOSX when it takes
a long time per frame to scroll.

BUG=607340

Review-Url: https://codereview.chromium.org/1932363002
Cr-Commit-Position: refs/heads/master@{#390942}
(cherry picked from commit dcd46c08887b38add468d81bf3b5bf4910d0f248)

Committed:
https://chromium.googlesource.com/chromium/src/+/84fdd1d3433ee491096cddea636f...
==========

[dtapuska, 2016-05-04 13:01:06]

Committed patchset #1 (id:1) manually as
84fdd1d3433ee491096cddea636f45491779483e.