[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/+/8523f7f3ca27cb7465acc94e4ab2fde5c35b8f87

[Donn Denman, 2016-07-16 06:13:27]

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/+/8523f7f3ca27cb7465acc94e4ab2...
==========

[Donn Denman, 2016-07-16 06:13:29]

Committed patchset #1 (id:1) manually as
8523f7f3ca27cb7465acc94e4ab2fde5c35b8f87.