llvm_coverage_build: Use CC and CXX variables by default

llvm_coverage_build: Use CC and CXX variables by default

NOTRY=true
BUG=skia:2430
Committed: https://skia.googlesource.com/skia/+/5150a77ee70b4ea07e3c1721f74b0f3c79a4bd58

[borenet, 2015-07-17 13:56:04]

borenet@google.com changed reviewers:
+ mtklein@google.com

[borenet, 2015-07-17 13:56:04]

We'll override these variables on the bot.

[mtklein, 2015-07-17 14:14:16]

The CQ bit was checked by mtklein@google.com

[mtklein, 2015-07-17 14:14:16]

lgtm

[commit-bot: I haz the power, 2015-07-17 14:14:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1242573003/1

[borenet, 2015-07-17 14:17:44]

The CQ bit was unchecked by borenet@google.com

[borenet, 2015-07-17 14:20:08]

Patch set 2 explains why we need 3.6.

[borenet, 2015-07-17 14:20:12]

The CQ bit was checked by borenet@google.com

[borenet, 2015-07-17 14:20:13]

The patchset sent to the CQ was uploaded after l-g-t-m from mtklein@google.com
Link to the patchset: https://codereview.chromium.org/1242573003/#ps20001
(title: "Tweak version comment")

[commit-bot: I haz the power, 2015-07-17 14:20:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1242573003/20001

[borenet, 2015-07-17 14:30:21]

The CQ bit was unchecked by borenet@google.com

[borenet, 2015-07-17 14:30:29]

The CQ bit was checked by borenet@google.com

[commit-bot: I haz the power, 2015-07-17 14:30:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1242573003/20001

[commit-bot: I haz the power, 2015-07-17 14:31:09]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/5150a77ee70b4ea07e3c1721f74b0f3c79a4bd58