Make WebView keep keyboard when losing focus (2nd cherrypick)

Make WebView keep keyboard when losing focus (2nd cherrypick)

WebView should not hide keyboard when losing focus. As for Chrome, it
should keep current behavior. These cases include when the ContentView is
hidden (closing current tab, opening a new tab, switching to an existing
tab), and when imeAdapter is attached to its native counterpart(navigation).
Note that this CL will change one behavior of Chrome: keyboard will not be
hidden when focus moves from ContentView to UrlBar.

BUG=636237
Review-Url: https://codereview.chromium.org/2290133002
Cr-Commit-Position: refs/heads/master@{#429531}
Committed: https://chromium.googlesource.com/chromium/src/+/af689b896e2307286cc6b82b2728fe16b483f897

[aelias_dont_use, 2016-11-10 06:47:26]

Description was changed from

==========
Make WebView keep keyboard when losing focus (2nd cherrypick)

WebView should not hide keyboard when losing focus. As for Chrome, it
should keep current behavior. These cases include when the ContentView is
hidden (closing current tab, opening a new tab, switching to an existing
tab), and when imeAdapter is attached to its native counterpart(navigation).
Note that this CL will change one behavior of Chrome: keyboard will not be
hidden when focus moves from ContentView to UrlBar.

BUG=636237

Review-Url: https://codereview.chromium.org/2290133002
Cr-Commit-Position: refs/heads/master@{#429531}
==========

to

==========
Make WebView keep keyboard when losing focus (2nd cherrypick)

WebView should not hide keyboard when losing focus. As for Chrome, it
should keep current behavior. These cases include when the ContentView is
hidden (closing current tab, opening a new tab, switching to an existing
tab), and when imeAdapter is attached to its native counterpart(navigation).
Note that this CL will change one behavior of Chrome: keyboard will not be
hidden when focus moves from ContentView to UrlBar.

BUG=636237

Review-Url: https://codereview.chromium.org/2290133002
Cr-Commit-Position: refs/heads/master@{#429531}
Committed:
https://chromium.googlesource.com/chromium/src/+/af689b896e2307286cc6b82b2728...
==========

[aelias_dont_use, 2016-11-10 06:47:27]

Committed patchset #1 (id:1) manually as
af689b896e2307286cc6b82b2728fe16b483f897.