Make GrContext::freeGpuResources() purge the resource cache

Make GrContext::freeGpuResources() purge the resource cache

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/3033b9faac476fc22e264950764d3551a32e4db7

[bsalomon, 2015-04-13 17:27:37]

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

[bsalomon, 2015-04-13 17:27:41]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2015-04-13 17:27:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1082783002/1

[commit-bot: I haz the power, 2015-04-13 17:27:55]

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 2015-04-13 23:27 UTC

[commit-bot: I haz the power, 2015-04-13 17:31:19]

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 2015-04-13 23:31 UTC

[commit-bot: I haz the power, 2015-04-13 17:46:20]

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 2015-04-13 23:46 UTC

[commit-bot: I haz the power, 2015-04-13 18:01:19]

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 2015-04-14 00:01 UTC

[robertphillips, 2015-04-13 18:07:51]

lgtm

[commit-bot: I haz the power, 2015-04-13 18:10:04]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/3033b9faac476fc22e264950764d3551a32e4db7