Fix Vietnamese characters to work correctly on contenteditable

Fix Vietnamese characters to work correctly on contenteditable

Blink seems to convert a normal space (\20) into a non-breaking space
(\a0) only when Vietnamese + contenteditable is used.

The immediate solution for M55 is to copy the same replacing logic from
ReplicaInputConnection to ThreadedInputConnection.

FYI, the ReplicaInputConnection logic was there from the beginning:

https://chromiumcodereview.appspot.com/10911012/diff/10001/content/
public/android/java/src/org/chromium/content/browser/ContentViewCore.java

BUG=663880
Review-Url: https://codereview.chromium.org/2489233004
Cr-Commit-Position: refs/heads/master@{#431363}
(cherry picked from commit a90b47231f92d86db194138b952ad0910ee923eb)

Committed: https://chromium.googlesource.com/chromium/src/+/d744333cb7410f973555d755778b3fa85a2c1c52

[Changwan Ryu, 2016-11-10 23:11:39]

Description was changed from

==========
Fix Vietnamese characters to work correctly on contenteditable

Blink seems to convert a normal space (\20) into a non-breaking space
(\a0) only when Vietnamese + contenteditable is used.

The immediate solution for M55 is to copy the same replacing logic from
ReplicaInputConnection to ThreadedInputConnection.

FYI, the ReplicaInputConnection logic was there from the beginning:

https://chromiumcodereview.appspot.com/10911012/diff/10001/content/
public/android/java/src/org/chromium/content/browser/ContentViewCore.java

BUG=663880

Review-Url: https://codereview.chromium.org/2489233004
Cr-Commit-Position: refs/heads/master@{#431363}
(cherry picked from commit a90b47231f92d86db194138b952ad0910ee923eb)
==========

to

==========
Fix Vietnamese characters to work correctly on contenteditable

Blink seems to convert a normal space (\20) into a non-breaking space
(\a0) only when Vietnamese + contenteditable is used.

The immediate solution for M55 is to copy the same replacing logic from
ReplicaInputConnection to ThreadedInputConnection.

FYI, the ReplicaInputConnection logic was there from the beginning:

https://chromiumcodereview.appspot.com/10911012/diff/10001/content/
public/android/java/src/org/chromium/content/browser/ContentViewCore.java

BUG=663880

Review-Url: https://codereview.chromium.org/2489233004
Cr-Commit-Position: refs/heads/master@{#431363}
(cherry picked from commit a90b47231f92d86db194138b952ad0910ee923eb)

Committed:
https://chromium.googlesource.com/chromium/src/+/d744333cb7410f973555d755778b...
==========

[Changwan Ryu, 2016-11-10 23:11:41]

Committed patchset #1 (id:1) manually as
d744333cb7410f973555d755778b3fa85a2c1c52.