Lazy image decoding to reduce bench_record overhead.

Lazy image decoding to reduce bench_record overhead.

We want bench_record to time recording only, and are willing to accept
some time spent playing back the source pictures only out of necessity.

This lets us skip the JPEG and PNG decoding, which are a pretty fair
chunk of time.  Should mean better record numbers at the same --loops.

BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=13977

[mtklein, 2014-03-28 15:00:37]

+Hal

[hal.canary, 2014-03-28 15:04:37]

lgtm

[mtklein, 2014-03-28 15:04:45]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-03-28 15:04:52]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/212563009/1

[commit-bot: I haz the power, 2014-03-28 16:08:29]

Change committed as 13977

[tomhudson, 2014-03-31 12:21:16]

Wanted: gmail filter guru to fix my filters so review requests like this don't
show up at the bottom of a trivial folder instead of the top of my priority
inbox.

[mtklein, 2014-03-31 14:48:43]

On 2014/03/31 12:21:16, tomhudson wrote:
> Wanted: gmail filter guru to fix my filters so review requests like this don't
> show up at the bottom of a trivial folder instead of the top of my priority
> inbox.

I have to:me and from:me labels and filters.  So my inbox list looks like

Inbox (24)
Starred
from:me (1)
to:me (8)
More ...