Roll Metrics proto.

Bug: 1088488
Change-Id: I359e3deb4ed4f407f3e756b7b808b444cb4de830
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253023
Auto-Submit: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780040}

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 316750408
-Date: 2020/06/16 UTC
+Version: 317162786
+Date: 2020/06/18 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/ukm/report.proto

@@ -11,16 +11,22 @@ package ukm;
 import "ukm/aggregate.proto";
 import "ukm/entry.proto";
 import "ukm/source.proto";
+import "chrome_user_metrics_extension.proto";
 import "system_profile.proto";
 import "user_demographics.proto";
 
 // This is the message type sent from Chrome to the UKM collector.
-// Next tag: 12
+// Next tag: 13
 message Report {
   // A unique identifier for a Chrome install. This ID should be used only
   // in UKM reports, and not linked to any other data sources.
   optional fixed64 client_id = 1;
 
+  // The product corresponding to this log. Note: The default value is Chrome,
+  // so Chrome products will not transmit this field.
+  optional metrics.ChromeUserMetricsExtension.Product product = 12
+      [default = CHROME];
+
   // The session id for this record. This id is unique within a
   // particular Chrome session. The client keeps track of the session id
   // and sends it with each record. The session id is simply an integer