Adding Chromium authors to the AUTHORS file.

Some Googlers commit code into Skia using their chromium.org accounts.
The Chromium AUTHORS file has a similar entry:
http://src.chromium.org/viewvc/chrome/trunk/src/AUTHORS

(SkipBuildbotRuns)

NOTRY=true
BUG=skia:2072
R=hcm@google.com

Author: rmistry@google.com

Review URL: https://codereview.chromium.org/146853004

git-svn-id: http://skia.googlecode.com/svn/trunk@13271 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/AUTHORS b/AUTHORS
index 84f2826..6342ba6 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -15,5 +15,5 @@
 Google Inc. <*@google.com>
 Intel <*@intel.com>
 NVIDIA <*@nvidia.com>
+The Chromium Authors <*@chromium.org>
 Thiago Fransosi Farina <thiago.farina@gmail.com>
-