Merge 254840 "ppapi: Send sync point whenever the pepper texture..."

Merge 254840 "ppapi: Send sync point whenever the pepper texture..."

> ppapi: Send sync point whenever the pepper texture changes.
> 
> When giving a texture mailbox to the compositor, it's important
> to give a sync point along with it, so the browser compositor does
> not display the texture before it is ready.
> 
> Currently pepper is giving the mailbox to the compositor once
> (without a sync point) and then just telling it that the texture
> changed, without specifying a sync point for those changes.
> 
> Change it to always send a sync point with the mailbox, and when
> the texture changes, reset the mailbox with a new sync point for
> each frame.
> 
> BUG=333024
> 
> Review URL: https://codereview.chromium.org/185363009

TBR=danakj@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=255444

[danakj, 2014-03-06 22:04:25]

Committed patchset #1 manually as r255444.