Adding tileGrid scaled playback capability to gm.

Adding tileGrid scaled playback capability to gm.

BUG=http://code.google.com/p/skia/issues/detail?id=1021
Committed: https://code.google.com/p/skia/source/detail?r=6898

[junov1, 2012-12-18 22:07:28]

PTAL

[junov1, 2012-12-18 22:11:05]

On 2012/12/18 22:07:28, junov1 wrote:
> PTAL

FYI the tests currently have failures with non-one scale factors, which is why
the default value for for the new --tileGridReplayScales argument is currently
1.0 (so it won't fail on the bots).  Once it is fixed, I intend to change the
default to 0.1,1.0,10 (or something like that).

[reed1, 2012-12-18 22:19:22]

... adding Edison

[EricB, 2012-12-19 15:17:19]

LGTM with question.

https://codereview.appspot.com/6937077/diff/1/gm/gmmain.cpp
File gm/gmmain.cpp (right):

https://codereview.appspot.com/6937077/diff/1/gm/gmmain.cpp#newcode1081
gm/gmmain.cpp:1081: ++argv;
Would it be better to error-check here as well?

if (argv >= stop) {
  usage(commandName);
  return -1;
}

[junov1, 2012-12-19 15:21:51]

> Would it be better to error-check here as well?

Totally.