Pepper: Fix texture color format in VideoDecoderShim.

Pepper: Fix texture color format in VideoDecoderShim.
The RGB pixel components are flipped in the software decoder
implementation.

Also add latency calculation to example plugin.
Flip picture vertically (it was upside down).

BUG=281689
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278237

[dmichael (off chromium), 2014-06-18 17:39:06]

Seems like this would make more sense as 2 CLs? But it's still small, I guess,
so lgtm.

Or you can split the changes to the example in to another CL and I'll
rubberstamp it. Up to you.

[bbudge, 2014-06-18 17:53:50]

The CQ bit was checked by bbudge@chromium.org

[bbudge, 2014-06-18 17:55:30]

On 2014/06/18 17:39:06, dmichael wrote:
> Seems like this would make more sense as 2 CLs? But it's still small, I guess,
> so lgtm.
> 
> Or you can split the changes to the example in to another CL and I'll
> rubberstamp it. Up to you.

OK, this CL will contain the RGB flip fix.

[commit-bot: I haz the power, 2014-06-18 17:55:36]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bbudge@chromium.org/346543002/120001

[commit-bot: I haz the power, 2014-06-19 01:48:59]

Change committed as 278237