Improve the speech panel's performance

Improve the speech panel's performance

Currently, ChromeVox sends all queued speech output to the speech panel.

This unfortunately causes performance issues.

For example, in Gmail, if ChromeVox sends ~500 utterances, which can happen if we have a large block of text (since we split on sentences), ChromeVox stops responding to key commands.

ChromeVox should stay responsive in any situation especially if a user taps on the control key repeatedly.

This change makes it so we only show the currently spoken text which gets around the potentially expensive calls to send text to the panel background page (which blocks).

BUG=672955
TBR=dtseng@chromium.org

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2570593002
Cr-Commit-Position: refs/heads/master@{#438083}
(cherry picked from commit 120bb61b5fd467ef232a893bd7b040fc208ee4c4)

Committed: https://chromium.googlesource.com/chromium/src/+/cc01623505fb20e30e21fc34614801be58758e56

[David Tseng, 2016-12-13 23:33:49]

Description was changed from

==========
Improve the speech panel's performance

Currently, ChromeVox sends all queued speech output to the speech panel.

This unfortunately causes performance issues.

For example, in Gmail, if ChromeVox sends ~500 utterances, which can happen if
we have a large block of text (since we split on sentences), ChromeVox stops
responding to key commands.

ChromeVox should stay responsive in any situation especially if a user taps on
the control key repeatedly.

This change makes it so we only show the currently spoken text which gets around
the potentially expensive calls to send text to the panel background page (which
blocks).

BUG=672955
TBR=dtseng@chromium.org

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2570593002
Cr-Commit-Position: refs/heads/master@{#438083}
(cherry picked from commit 120bb61b5fd467ef232a893bd7b040fc208ee4c4)
==========

to

==========
Improve the speech panel's performance

Currently, ChromeVox sends all queued speech output to the speech panel.

This unfortunately causes performance issues.

For example, in Gmail, if ChromeVox sends ~500 utterances, which can happen if
we have a large block of text (since we split on sentences), ChromeVox stops
responding to key commands.

ChromeVox should stay responsive in any situation especially if a user taps on
the control key repeatedly.

This change makes it so we only show the currently spoken text which gets around
the potentially expensive calls to send text to the panel background page (which
blocks).

BUG=672955
TBR=dtseng@chromium.org

CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2570593002
Cr-Commit-Position: refs/heads/master@{#438083}
(cherry picked from commit 120bb61b5fd467ef232a893bd7b040fc208ee4c4)

Committed:
https://chromium.googlesource.com/chromium/src/+/cc01623505fb20e30e21fc346148...
==========

[David Tseng, 2016-12-13 23:33:50]

Committed patchset #1 (id:1) manually as
cc01623505fb20e30e21fc34614801be58758e56 (presubmit successful).