Make sure fast-path scrolls bubble on non-scrollable guest.

Make sure fast-path scrolls bubble on non-scrollable guest.

Fast-path scrolling on a document with no ability to scroll
generates event acks of
INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS, which at present
the RenderWidgetHostViewGuest::{Gesture|Wheel}EventAck()
methods don't recognize.

This CL enables forwarding for "no consumer exists" events.
Existing tests are extended to test against both cases:
guests that are and are not scrollable.

BUG=491940
Committed: https://crrev.com/ab64ac02df18faa4cf307bd21ddec6b628f79ace
Cr-Commit-Position: refs/heads/master@{#351795}

[wjmaclean, 2015-09-30 19:43:46]

The CQ bit was checked by wjmaclean@chromium.org to run a CQ dry run

[wjmaclean, 2015-09-30 19:44:08]

wjmaclean@chromium.org changed reviewers:
+ creis@chromium.org, kenrb@chromium.org

[commit-bot: I haz the power, 2015-09-30 19:44:30]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377173005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377173005/1

[wjmaclean, 2015-09-30 19:45:17]

kenrb@ - Can you please do a pre-review, particular attention to
RenderWidgetHostViewGuest code? (** small change **)

[commit-bot: I haz the power, 2015-09-30 19:50:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-30 19:50:51]

Dry run: Try jobs failed on following builders:
  win_chromium_compile_dbg_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[kenrb, 2015-09-30 19:58:29]

This looks fine.

[wjmaclean, 2015-09-30 20:07:48]

creis@ - please take a look when you get a moment? Thanks!

[Charlie Reis, 2015-09-30 21:20:23]

creis@chromium.org changed reviewers:
+ nick@chromium.org

[Charlie Reis, 2015-09-30 21:20:24]

I think I'll let Nick review this one for owners, since I really don't know this
code very well.

[ncarter (slow), 2015-09-30 21:37:19]

lgtm

https://codereview.chromium.org/1377173005/diff/1/chrome/browser/apps/guest_v...
File chrome/browser/apps/guest_view/web_view_browsertest.cc (right):

https://codereview.chromium.org/1377173005/diff/1/chrome/browser/apps/guest_v...
chrome/browser/apps/guest_view/web_view_browsertest.cc:2560: // Create two test
instances, one where theguest body is scrollable and the
"theguest"

[wjmaclean, 2015-10-01 12:49:04]

The CQ bit was checked by wjmaclean@chromium.org

[wjmaclean, 2015-10-01 12:49:05]

The patchset sent to the CQ was uploaded after l-g-t-m from nick@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/1377173005/#ps20001
(title: "Fix comment.")

[commit-bot: I haz the power, 2015-10-01 12:49:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377173005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377173005/20001

[commit-bot: I haz the power, 2015-10-01 14:29:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-01 14:31:43]

Patchset 2 (id:??) landed as
https://crrev.com/ab64ac02df18faa4cf307bd21ddec6b628f79ace
Cr-Commit-Position: refs/heads/master@{#351795}