> View::HandleAccessibleAction won't be called when using ChromeVox

I'd be up for fixing that.

Let's move most of the code from ax_view_obj_wrapper.cc to View::HandleAccessibleAction

In the few cases where that doesn't make sense, ax_view_obj_wrapper.cc should call View first and only handle it if the View returns null.

Want to make this change?

What's the specific use-case where you wanted to override the action on a View, by the way?

I've created an experimental change (crrev.com/2767143007). It seems to pass the tests at least. Could you take a look at it?

I tried to provide expanding/collapsing action on ARC notifications. It expands when a user presses Search+Space on an expandable notification first time. If the user presses Search+Space once more, it opens.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e80b960e27af6495ff3dd79cbfcede18d48da85a

commit e80b960e27af6495ff3dd79cbfcede18d48da85a
Author: yhanada <yhanada@chromium.org>
Date: Wed Mar 29 01:00:51 2017

Try |View::HandleAccessibleAction| before falling back to fixed actions.

Currently automation API always do the fixed action for each
accessible action. For example, clicking on the center of the target
view is always triggered when AX_ACTION_DO_DEFAULT is passed to
automation API.

This CL makes automation API try to use |View::HandleAccessibleAction|
first. This change enables us to implement custom action on accessible
actions.

BUG= 705350 

Review-Url: https://codereview.chromium.org/2767143007
Cr-Commit-Position: refs/heads/master@{#460255}

[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/chrome/browser/ui/aura/accessibility/automation_manager_aura.cc
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/chrome/browser/ui/aura/accessibility/ax_tree_source_aura.cc
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/chrome/browser/ui/aura/accessibility/ax_tree_source_aura.h
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/ui/views/BUILD.gn
[add] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/ui/views/accessibility/ax_aura_obj_wrapper.cc
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/ui/views/accessibility/ax_aura_obj_wrapper.h
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/ui/views/accessibility/ax_view_obj_wrapper.cc
[modify] https://crrev.com/e80b960e27af6495ff3dd79cbfcede18d48da85a/ui/views/accessibility/ax_view_obj_wrapper.h