Roll metrics_proto changes

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//third_party/metrics_proto/README.chromium

Bug: 1127134
Change-Id: I0afff9e9bd3e4e74a0bc547ac397bffcefc67046
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424553
Auto-Submit: Ken Rockot <rockot@google.com>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#809512}

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 329948683
-Date: 2020/09/03 UTC
+Version: 333124299
+Date: 2020/09/22 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/histogram_event.proto

@@ -25,6 +25,7 @@ message HistogramEventProto {
   optional int64 sum = 2;
 
   // The per-bucket data.
+  // Next tag: 5
   message Bucket {
     // Each bucket's range is bounded by min <= x < max.
     // It is valid to omit one of these two fields in a bucket, but not both.
@@ -35,12 +36,6 @@ message HistogramEventProto {
     optional int64 min = 1;
     optional int64 max = 2;
 
-    // The bucket's index in the list of buckets, sorted in ascending order.
-    // This field was intended to provide extra redundancy to detect corrupted
-    // records, but was never used.  As of M31, it is no longer sent by Chrome
-    // clients to reduce the UMA upload size.
-    optional int32 bucket_index = 3 [deprecated = true];
-
     // The number of entries in this bucket.  As of M51, when the value of this
     // field would be 1, the field will be omitted instead.
     optional int64 count = 4 [default = 1];

third_party/metrics_proto/omnibox_event.proto

@@ -98,13 +98,13 @@ message OmniboxEventProto {
     // An invalid URL; shouldn't happen.
     INVALID_SPEC = 0;
 
-    // chrome://newtab/.  This can be either the built-in version or a
-    // replacement new tab page from an extension.  Note that when Instant
-    // Extended is enabled, the new tab page will be reported as either
-    // INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS or
-    // INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS below,
-    // unless an extension is replacing the new tab page, in which case
-    // it will still be reported as NTP.
+    // chrome://newtab/.  For modern versions of Chrome, this is only reported
+    // when an extension is replacing the new tab page. Otherwise, new tab
+    // page interactions will be reported as NTP_REALBOX,
+    // INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS or
+    // INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS.
+    // For old versions of Chrome, this was reported for the default New Tab
+    // Page.
     NTP = 1;
 
     // about:blank.
@@ -131,8 +131,9 @@ message OmniboxEventProto {
     // with the user having focus in the omnibox.
     INSTANT_NTP_WITH_OMNIBOX_AS_STARTING_FOCUS = 7;
 
-    // The new tab page in which this omnibox interaction first started
-    // with the user having focus in the fakebox.
+    // The new tab page in which this omnibox interaction first started with the
+    // user having focus in the fakebox. Note that this started being replaced
+    // by NTP_REALBOX in Aug 2020 and will eventually be obsolete.
     INSTANT_NTP_WITH_FAKEBOX_AS_STARTING_FOCUS = 8;
 
     // The user is on a search result page that does not do search term
@@ -285,6 +286,8 @@ message OmniboxEventProto {
                                    // suggestion.
       CLIPBOARD_TEXT = 28;         // Text based on the clipboard.
       CLIPBOARD_IMAGE = 29;        // An image based on the clipboard.
+      TILE_SUGGESTION = 30;        // A search query from Chrome Query Tiles
+                                   // feature. Only used by Android.
     }
     optional ResultType result_type = 2;
 

third_party/metrics_proto/system_profile.proto

@@ -343,6 +343,7 @@ message SystemProfileProto {
       // to be used in logs processing as a more convenient way to manage the
       // ambiguous case when breaking down stats by connection_type.
       CONNECTION_AMBIGUOUS = 8;
+      CONNECTION_5G = 9;
     }
     // The connection type according to NetworkChangeNotifier.
     optional ConnectionType connection_type = 2;