athena: Provide a temporary onTextInputBoxFocused.addListener implementation.

athena: Provide a temporary onTextInputBoxFocused.addListener implementation.

The virtual keyboard bindings will be provided by mojo soon. Until then, this is
a temporary hack to provide an implementation for the missing API. The virtual
keyboard shows up in athena with this last change.

BUG=380215
R=bshe@chromium.org, oshima@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278841

[sadrul, 2014-06-20 16:32:48]

A better CL that uses mojo is in progress:
https://codereview.chromium.org/328303008/ But that's still going to need some
work. So this is a short-term workaround.

[sadrul, 2014-06-20 19:33:00]

+oshima@ for owner

[oshima, 2014-06-20 20:01:09]

lgtm

[bshe, 2014-06-20 21:00:31]

lgtm

https://codereview.chromium.org/348823003/diff/20001/athena/virtual_keyboard/...
File athena/virtual_keyboard/virtual_keyboard_bindings_impl.cc (right):

https://codereview.chromium.org/348823003/diff/20001/athena/virtual_keyboard/...
athena/virtual_keyboard/virtual_keyboard_bindings_impl.cc:119:
base::UTF8ToUTF16(kInputBoxFocusedEvent));
Just curios when is this javascript been executed?

[sadrul, 2014-06-20 22:24:46]

https://codereview.chromium.org/348823003/diff/20001/athena/virtual_keyboard/...
File athena/virtual_keyboard/virtual_keyboard_bindings_impl.cc (right):

https://codereview.chromium.org/348823003/diff/20001/athena/virtual_keyboard/...
athena/virtual_keyboard/virtual_keyboard_bindings_impl.cc:119:
base::UTF8ToUTF16(kInputBoxFocusedEvent));
On 2014/06/20 21:00:30, bshe wrote:
> Just curios when is this javascript been executed? 

This happens when the page navigates to chrome://keyboard/, before the JS on the
page (e.g. from keyboard.js).

[sadrul, 2014-06-20 22:38:15]

Committed patchset #2 manually as r278841 (presubmit successful).