Add chrome channel to cert logger reports

components/certificate_reporting/cert_logger.proto

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This protobuffer is intended to store reports from Chrome users of
 // certificate errors. A report will be sent from Chrome when it gets
 // e.g. a certificate for google.com that chains up to a root CA not expected by
 // Chrome for that origin, such as DigiNotar (compromised in July 2011), or
 // other pinning errors such as a blacklisted cert in the chain, or
 // (when opted in) other certificate validation errors like an expired
@@ skipping 130 matching lines @@
   // error, not the library).
   optional bool is_issued_by_known_root = 9;
 
   // Information about features that were enabled or disabled for the
   // user that might affect certificate validation.
   optional CertLoggerFeaturesInfo features_info = 10;
 
   // False when the report is attempted to be uploaded for the first time. True
   // in all other uploads.
   optional bool is_retry_upload = 11;
+
+  enum ChromeChannel {
+    CHROME_CHANNEL_NONE = 0;
+    CHROME_CHANNEL_UNKNOWN = 1;
+    CHROME_CHANNEL_DEV = 2;
+    CHROME_CHANNEL_CANARY = 3;
+    CHROME_CHANNEL_BETA = 4;
+    CHROME_CHANNEL_STABLE = 5;
+  };
+
+  // The Chrome channel that this error occurred on.
+  optional ChromeChannel chrome_channel = 12;
 };