Add visualbench option to not reset between samples

Add visualbench option to not reset between samples

Adds a --reset flag that controls whether we teardown the graphics
context between samples. Also modifies the timing algorithm to always/
only pre-warm after resetting the context.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/266e2024ec487425f56473e272a6b81bfbf2c543

[Chris Dalton, 2015-11-13 07:45:01]

cdalton@nvidia.com changed reviewers:
+ joshualitt@google.com

[Chris Dalton, 2015-11-13 07:45:01]

https://codereview.chromium.org/1442643007/diff/1/tools/VisualBench/VisualInt...
File tools/VisualBench/VisualInteractiveModule.cpp (left):

https://codereview.chromium.org/1442643007/diff/1/tools/VisualBench/VisualInt...
tools/VisualBench/VisualInteractiveModule.cpp:18: : INHERITED(owner, false)
This is the only change in default behavior.

Since the default is to reset between samples, we are going to start performing
a pre-warm between samples in interactive mode except for when --reset is set to
false.

I think this will be a positive change though, since a pre-warm is actually
necessary after a reset.

[joshualitt, 2015-11-13 16:07:02]

On 2015/11/13 07:45:01, Chris Dalton wrote:
>
https://codereview.chromium.org/1442643007/diff/1/tools/VisualBench/VisualInt...
> File tools/VisualBench/VisualInteractiveModule.cpp (left):
> 
>
https://codereview.chromium.org/1442643007/diff/1/tools/VisualBench/VisualInt...
> tools/VisualBench/VisualInteractiveModule.cpp:18: : INHERITED(owner, false)
> This is the only change in default behavior.
> 
> Since the default is to reset between samples, we are going to start
performing
> a pre-warm between samples in interactive mode except for when --reset is set
to
> false.
> 
> I think this will be a positive change though, since a pre-warm is actually
> necessary after a reset.

lgtm

[Chris Dalton, 2015-11-13 16:12:25]

The CQ bit was checked by cdalton@nvidia.com

[commit-bot: I haz the power, 2015-11-13 16:12:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1442643007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1442643007/1

[commit-bot: I haz the power, 2015-11-13 16:28:52]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/266e2024ec487425f56473e272a6b81bfbf2c543