Add debugging flag --simulate-touch-screen-with-mouse.

Add debugging flag --simulate-touch-screen-with-mouse.

This flag causes mouse events to be mapped to touch gesture events in
RenderWidgetHost:
- Hold left mouse button and move: GestureScrollUpdate
- Hold right mouse button and move on Y axis: GesturePinchUpdate
- Middle mouse button down: GestureTapDown
- Middle mouse button up: GestureTap

This provides a convenient way to test touch-oriented features with only
an ordinary Linux machine.

Note that to get pinch gesture support, --enable-threaded-compositing
must also be set.

BUG=132607
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=150274

[aelias_OOO_until_Jul13, 2012-08-03 22:01:57]

People are having trouble getting the specialized hardware/builds running for
touchscreen support, so I whipped up this debugging feature that should be very
helpful particularly for the ongoing pinch-zoom work.

[jam, 2012-08-06 18:33:21]

http://codereview.chromium.org/10825192/diff/1/content/browser/renderer_host/...
File content/browser/renderer_host/render_widget_host_impl.cc (right):

http://codereview.chromium.org/10825192/diff/1/content/browser/renderer_host/...
content/browser/renderer_host/render_widget_host_impl.cc:758: {
nit: this function is using webkit style, please convert to google style. i.e.
parameter names with underscores, brace bracket on previous line, 2 line
spacing, function name starts with capital

[aelias_OOO_until_Jul13, 2012-08-06 18:46:30]

https://chromiumcodereview.appspot.com/10825192/diff/1/content/browser/render...
File content/browser/renderer_host/render_widget_host_impl.cc (right):

https://chromiumcodereview.appspot.com/10825192/diff/1/content/browser/render...
content/browser/renderer_host/render_widget_host_impl.cc:758: {
Done.  By the way, is there a style checker tool I can run locally?

[jam, 2012-08-06 19:07:38]

lgtm

[commit-bot: I haz the power, 2012-08-06 19:16:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/10825192/3001

[commit-bot: I haz the power, 2012-08-06 19:33:53]

Try job failure for 10825192-3001 (retry) on android for steps "compile, build"
(clobber build).
It's a second try, previously, steps "compile, build" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=android&nu...

[commit-bot: I haz the power, 2012-08-06 20:44:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/10825192/7003

[commit-bot: I haz the power, 2012-08-06 22:20:59]

Try job failure for 10825192-7003 (retry) on linux_chromeos for step "compile"
(clobber build).
It's a second try, previously, step "compile" failed.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[commit-bot: I haz the power, 2012-08-07 02:51:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/aelias@chromium.org/10825192/7003

[commit-bot: I haz the power, 2012-08-07 04:41:35]

Change committed as 150274