cc: Fix for synced property main thread updates with MFBA.

cc: Fix for synced property main thread updates with MFBA.

Main thread before activation allows sending BeginMainFrames while there
is a pending tree. In this mode pulling deltas from SyncedProperty for
BeginMainFrame should not be incorrect in between commit and activation
of a previous frame.

BUG=616086
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2035543003
Cr-Commit-Position: refs/heads/master@{#399079}
(cherry picked from commit d2580f5c4fd242f3b0bfe03fbad71e4db5b5fa08)

Committed: https://chromium.googlesource.com/chromium/src/+/d924383891e9d4c575f181dd8347e2f0392fb177

[sunnyps, 2016-06-13 19:30:57]

Description was changed from

==========
cc: Fix for synced property main thread updates with MFBA.

Main thread before activation allows sending BeginMainFrames while there
is a pending tree. In this mode pulling deltas from SyncedProperty for
BeginMainFrame should not be incorrect in between commit and activation
of a previous frame.

BUG=616086
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2035543003
Cr-Commit-Position: refs/heads/master@{#399079}
(cherry picked from commit d2580f5c4fd242f3b0bfe03fbad71e4db5b5fa08)
==========

to

==========
cc: Fix for synced property main thread updates with MFBA.

Main thread before activation allows sending BeginMainFrames while there
is a pending tree. In this mode pulling deltas from SyncedProperty for
BeginMainFrame should not be incorrect in between commit and activation
of a previous frame.

BUG=616086
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review-Url: https://codereview.chromium.org/2035543003
Cr-Commit-Position: refs/heads/master@{#399079}
(cherry picked from commit d2580f5c4fd242f3b0bfe03fbad71e4db5b5fa08)

Committed:
https://chromium.googlesource.com/chromium/src/+/d924383891e9d4c575f181dd8347...
==========

[sunnyps, 2016-06-13 19:30:59]

Committed patchset #1 (id:1) manually as
d924383891e9d4c575f181dd8347e2f0392fb177.