Omnibox: Log Elapsed Time Since Last Time The Default Match Changed

chrome/common/metrics/proto/omnibox_event.proto

 // Copyright (c) 2012 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.
 //
 // Stores information about an omnibox interaction.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package metrics;
 
-// Next tag: 13
+// Next tag: 14
 message OmniboxEventProto {
   // The timestamp for the event, in seconds since the epoch.
   optional int64 time = 1;
 
   // The id of the originating tab for this omnibox interaction.
   // This is the current tab *unless* the user opened the target in a new tab.
   // In those cases, this is unset.  Tab ids are unique for a given session_id
   // (in the containing protocol buffer ChromeUserMetricsExtensionsProto).
   optional int32 tab_id = 2;
 
@@ skipping 18 matching lines @@
   // (|selected_index| = 0) and will be omitted otherwise.
   optional int32 completed_length = 6;
 
   // The amount of time, in milliseconds, since the user first began modifying
   // the text in the omnibox.  If at some point after modifying the text, the
   // user reverts the modifications (thus seeing the current web page's URL
   // again), then writes in the omnibox again, this elapsed time should start
   // from the time of the second series of modification.
   optional int64 typing_duration_ms = 7;
 
+  // The amount of time, in milliseconds, since the last time the default
+  // (inline) match changed.  This may be longer than the time since the
+  // last keystroke.  (The last keystroke may not have changed the default
+  // match.)  It may also be shorter than the time since the last keystroke
+  // because the default match might have come from an asynchronous
+  // provider.  Regardless, it should always be less than or equal to
+  // the field |typing_duration_ms|.
+  optional int64 duration_since_last_default_match_update_ms = 13;
+
   // The type of page currently displayed when the user used the omnibox.
   enum PageClassification {
     INVALID_SPEC = 0;   // invalid URI; shouldn't happen
     NEW_TAB_PAGE = 1;   // chrome://newtab/
     // Note that chrome://newtab/ doesn't have to be the built-in
     // version; it could be replaced by an extension.
     BLANK = 2;          // about:blank
     HOMEPAGE = 3;       // user switched settings to "open this page" mode.
     // Note that if the homepage is set to the new tab page or about blank,
     // then we'll classify the web page into those categories, not HOMEPAGE.
@@ skipping 83 matching lines @@
 
     // The provider's done() value, i.e., whether it's completed processing
     // the query.  Providers which don't do any asynchronous processing
     // will always be done.
     optional bool provider_done = 2;
   }
   // A list of diagnostic information about each provider.  Providers
   // will appear at most once in this list.
   repeated ProviderInfo provider_info = 12;
 }