Add hardware monitoring to skpbench

Add hardware monitoring to skpbench

Adds a Hardware class with hooks for entering and exiting
"benchmarking" mode (e.g. locking clocks, etc.) as well as periodic
polling of hardware to verify the environment is stable.

Adds a partial implementation for generic Android hardware, but
ultimately we will need to write specific classes tailored to each
unique platform we need to test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2360473002

Committed: https://skia.googlesource.com/skia/+/d7a9db644496785100c4e61add1c9f8ed0494408

[csmartdalton, 2016-09-21 04:25:14]

Description was changed from

==========
Add hardware monitoring to skpbench

Adds a Hardware class with hooks for entering and exiting
"benchmarking" mode (e.g. locking clocks, etc.) as well as periodic
polling of hardware to verify the environment is stable.

Adds a partial implementation for generic Android hardware, but
ultimately we will need to write specific classes tailored to each
unique platform we need to test.

BUG=skia:
==========

to

==========
Add hardware monitoring to skpbench

Adds a Hardware class with hooks for entering and exiting
"benchmarking" mode (e.g. locking clocks, etc.) as well as periodic
polling of hardware to verify the environment is stable.

Adds a partial implementation for generic Android hardware, but
ultimately we will need to write specific classes tailored to each
unique platform we need to test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2360473002
==========

[csmartdalton, 2016-09-21 04:42:03]

csmartdalton@google.com changed reviewers:
+ bsalomon@google.com

[bsalomon, 2016-09-21 13:32:20]

rubberstamp lgtm

[csmartdalton, 2016-09-21 19:16:50]

The CQ bit was checked by csmartdalton@google.com

[commit-bot: I haz the power, 2016-09-21 19:16:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-22 12:10:06]

Description was changed from

==========
Add hardware monitoring to skpbench

Adds a Hardware class with hooks for entering and exiting
"benchmarking" mode (e.g. locking clocks, etc.) as well as periodic
polling of hardware to verify the environment is stable.

Adds a partial implementation for generic Android hardware, but
ultimately we will need to write specific classes tailored to each
unique platform we need to test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2360473002
==========

to

==========
Add hardware monitoring to skpbench

Adds a Hardware class with hooks for entering and exiting
"benchmarking" mode (e.g. locking clocks, etc.) as well as periodic
polling of hardware to verify the environment is stable.

Adds a partial implementation for generic Android hardware, but
ultimately we will need to write specific classes tailored to each
unique platform we need to test.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2360473002

Committed:
https://skia.googlesource.com/skia/+/d7a9db644496785100c4e61add1c9f8ed0494408
==========

[commit-bot: I haz the power, 2016-09-22 12:10:07]

Committed patchset #5 (id:80001) as
https://skia.googlesource.com/skia/+/d7a9db644496785100c4e61add1c9f8ed0494408