Add copyright to gyp/codec.gyp.

Add copyright to gyp/codec.gyp.

Committed: https://skia.googlesource.com/skia/+/648ac53ea3d707e46d3fa32904db41af4b46eafd

[scroggo, 2015-03-25 13:22:15]

TBR=msarett@google.com,rmistry@google.com

https://codereview.chromium.org/1011343003/#msg49 (different issue) failed the
CQ because gyp/codec.gyp did not have the correct copyright header (partially -
DM was also missing them, which I've fixed in a separate CL). I'm not sure what
the correct header is for a gyp file - many of our gyp files are missing them.
I'm happy to update, but I wanted to test first to see if my guess is the right
header.

[scroggo, 2015-03-25 13:22:20]

The CQ bit was checked by scroggo@google.com

[commit-bot: I haz the power, 2015-03-25 13:22:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1023673010/20001

[commit-bot: I haz the power, 2015-03-25 13:22:34]

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 2015-03-25 19:22 UTC

[mtklein, 2015-03-25 13:24:36]

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

[mtklein, 2015-03-25 13:24:36]

lgtm

[mtklein, 2015-03-25 13:25:36]

On 2015/03/25 13:24:36, mtklein wrote:
> lgtm

It looks for anything that looks like

Copyright Year Someone

Where Year and Someone are both pretty loose.

[commit-bot: I haz the power, 2015-03-25 14:16:19]

Committed patchset #2 (id:20001) as
https://skia.googlesource.com/skia/+/648ac53ea3d707e46d3fa32904db41af4b46eafd