Build gpu stats tracking in dev builds.

Build gpu stats tracking in dev builds.

Fix cache stats, add more info.

BUG=skia:2889
Committed: https://skia.googlesource.com/skia/+/24234fe77718a553ccc6ffdea0f2ee3ef414e0b6

[bsalomon, 2014-10-24 15:04:27]

The CQ bit was checked by bsalomon@google.com

[bsalomon, 2014-10-24 15:04:36]

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

[commit-bot: I haz the power, 2014-10-24 15:04:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/655263005/20001

[commit-bot: I haz the power, 2014-10-24 15:04:43]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-10-24 21:04 UTC

[commit-bot: I haz the power, 2014-10-24 15:06:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-24 15:06:51]

Try jobs failed on following builders:
  Test-Ubuntu13.10-GCE-NoGPU-x86_64-Debug-Trybot on client.skia
(http://build.chromium.org/p/client.skia/builders/Test-Ubuntu13.10-GCE-NoGPU-x...)

[bsalomon, 2014-10-24 15:28:50]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-10-24 15:29:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/655263005/60001

[commit-bot: I haz the power, 2014-10-24 15:29:52]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2014-10-24 21:29 UTC

[robertphillips, 2014-10-24 15:34:57]

lgtm

[commit-bot: I haz the power, 2014-10-24 16:34:47]

Committed patchset #4 (id:60001) as 24234fe77718a553ccc6ffdea0f2ee3ef414e0b6