Add API to event_sender.

Add API to content shell for trackpad scrolling for Blink layout tests.

- Added APIs for trackpad scroll begin/change/end events.
- Modified the API for momentum scroll begin to take additional parameters to
specify the deltaX and deltaY. Added the function MouseMomentumBegin2 to
accomplish this. This will be replaced by MouseMomentumBegin once the blink
change is landed.

BUG=330887
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271445

[erikchen, 2014-05-13 20:41:44]

This CL is a dependency for the Blink CL at
https://codereview.chromium.org/282743002/

[Nico, 2014-05-14 10:47:12]

Things spanning multiple CLs always should have a BUG=.

Thanks so much for looking at this :-)

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
File content/shell/renderer/test_runner/event_sender.h (right):

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
content/shell/renderer/test_runner/event_sender.h:151: void
MouseMomentumBegin2(gin::Arguments* args);
This looks strange. Why is there a MouseMomentumBegin2 function? Will one of the
two versions go away?

[erikchen, 2014-05-14 17:29:54]

PTAL

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
File content/shell/renderer/test_runner/event_sender.h (right):

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
content/shell/renderer/test_runner/event_sender.h:151: void
MouseMomentumBegin2(gin::Arguments* args);
On 2014/05/14 10:47:12, Nico (traveling this week) wrote:
> This looks strange. Why is there a MouseMomentumBegin2 function? Will one of
the
> two versions go away?

The zero parameter function MouseMomentumBegin will eventually go away. There's
a TODO to myself in the .cc file. I've also updated the description of this CL.

[jochen (gone - plz use gerrit), 2014-05-15 15:30:44]

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
File content/shell/renderer/test_runner/event_sender.cc (right):

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
content/shell/renderer/test_runner/event_sender.cc:373: void
TrackpadScrollBegin(gin::Arguments* args);
begin and end don't seem to use args?

[erikchen, 2014-05-15 16:23:03]

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
File content/shell/renderer/test_runner/event_sender.cc (right):

https://codereview.chromium.org/283713002/diff/20001/content/shell/renderer/t...
content/shell/renderer/test_runner/event_sender.cc:373: void
TrackpadScrollBegin(gin::Arguments* args);
On 2014/05/15 15:30:45, jochen wrote:
> begin and end don't seem to use args?

right you are. I've removed the parameter from the functions.

[jochen (gone - plz use gerrit), 2014-05-19 13:30:22]

lgtm

[erikchen, 2014-05-19 17:30:39]

The CQ bit was checked by erikchen@chromium.org

[commit-bot: I haz the power, 2014-05-19 17:31:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/erikchen@chromium.org/283713002/40001

[commit-bot: I haz the power, 2014-05-19 19:07:15]

Change committed as 271445