[TTS] Handle showing of a Context Menu more gracefully.

[TTS] Handle showing of a Context Menu more gracefully.

When the TTS UX is showing and the user activates a context menu,
the selection controller gets an event sequence that's confusing,
causing a tap-selection to show the selection handles.

This change hides the Contextual Search UX, and adds a state where
the selection controller knows to ignore the next event that would
show the selection handles, when a context menu has just been shown.

This change cleans up a sequence implicated in a crash, so that
won't be reproducible through triggering the Context Menu anymore.
(Issue 562353)

BUG=628436, 562353
Review-Url: https://codereview.chromium.org/2150213002
Cr-Commit-Position: refs/heads/master@{#405901}
(cherry picked from commit b09e3678e18b7d6447e1c758263d290b20b18a7f)

Committed: https://chromium.googlesource.com/chromium/src/+/fc73bd54293f704974c46c7c5043d50b98315eee

[amineer, 2016-07-18 18:34:47]

Description was changed from

==========
[TTS] Handle showing of a Context Menu more gracefully.

When the TTS UX is showing and the user activates a context menu,
the selection controller gets an event sequence that's confusing,
causing a tap-selection to show the selection handles.

This change hides the Contextual Search UX, and adds a state where
the selection controller knows to ignore the next event that would
show the selection handles, when a context menu has just been shown.

This change cleans up a sequence implicated in a crash, so that
won't be reproducible through triggering the Context Menu anymore.
(Issue 562353)

BUG=628436,562353

Review-Url: https://codereview.chromium.org/2150213002
Cr-Commit-Position: refs/heads/master@{#405901}
(cherry picked from commit b09e3678e18b7d6447e1c758263d290b20b18a7f)
==========

to

==========
[TTS] Handle showing of a Context Menu more gracefully.

When the TTS UX is showing and the user activates a context menu,
the selection controller gets an event sequence that's confusing,
causing a tap-selection to show the selection handles.

This change hides the Contextual Search UX, and adds a state where
the selection controller knows to ignore the next event that would
show the selection handles, when a context menu has just been shown.

This change cleans up a sequence implicated in a crash, so that
won't be reproducible through triggering the Context Menu anymore.
(Issue 562353)

BUG=628436,562353

Review-Url: https://codereview.chromium.org/2150213002
Cr-Commit-Position: refs/heads/master@{#405901}
(cherry picked from commit b09e3678e18b7d6447e1c758263d290b20b18a7f)

Committed:
https://chromium.googlesource.com/chromium/src/+/fc73bd54293f704974c46c7c5043...
==========

[amineer, 2016-07-18 18:34:48]

Committed patchset #1 (id:1) manually as
fc73bd54293f704974c46c7c5043d50b98315eee.