ASSERT each linkProgram leads to empty cache in ProgramInfoManager.

ASSERT each linkProgram leads to empty cache in ProgramInfoManager.

The current mechanism is to clean all cache, which is very misleading.

Everytime we call LinkProgram, we simply delete the Program in the map,
getting rid of all cahces, and create a new Program.

BUG=429053
TEST=gpu_unittests
R=bajones@chromium.org

Committed: https://crrev.com/8bd42c20b82615ed26a7791b94e79b55b9d93d19
Cr-Commit-Position: refs/heads/master@{#316937}

[Zhenyao Mo, 2015-02-18 21:19:06]

bajones: can you take a look at this one?

[bajones, 2015-02-18 23:35:59]

lgtm

[Zhenyao Mo, 2015-02-18 23:39:56]

The CQ bit was checked by zmo@chromium.org

[commit-bot: I haz the power, 2015-02-18 23:41:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/933393003/1

[commit-bot: I haz the power, 2015-02-19 00:45:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-19 00:46:25]

Patchset 1 (id:??) landed as
https://crrev.com/8bd42c20b82615ed26a7791b94e79b55b9d93d19
Cr-Commit-Position: refs/heads/master@{#316937}