Add system_bundle_version field to CastLogsProto

This adds an optional string field to CastDeviceMutableInfo
for logging system bundle versions.

Bug: b/154885519
Test: None
Change-Id: Ied9dd20045b26dc9f3ef628a0000e8bf27ddd187
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330319Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
Cr-Commit-Position: refs/heads/master@{#793396}

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 323579303
-Date: 2020/07/28 UTC
+Version: 324064953
+Date: 2020/07/30 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/cast_logs.proto

@@ -251,7 +251,7 @@ message CastLogsProto {
   optional fixed32 virtual_release_track = 4;
 
   // Cast specific device information which is expected to change over time.
-  // Next tag: 12
+  // Next tag: 13
   message CastDeviceMutableInfo {
     // This is the last type of reboot the device encountered
     // Next tag: 14
@@ -313,6 +313,9 @@ message CastLogsProto {
 
     // Optional field to log installed manifest version.
     optional uint32 installed_manifest_version = 11;
+
+    // Optional field to log the system bundle version.
+    optional string system_bundle_version = 12;
   }
   // The device sends this information at least once per day.
   optional CastDeviceMutableInfo cast_device_mutable_info = 5;

third_party/metrics_proto/system_profile.proto

@@ -949,6 +949,7 @@ message SystemProfileProto {
     ON_DEVICE_HEAD_SUGGEST = 25;
     CROS_SMART_DIM = 26;
     ZXCVBN_DATA = 27;
+    AUTOFILL_REGEX_CONSTANTS = 28;
   }
 
   // Information about what Chrome components are registered and at which