[Translate] Integrate TranslateEventProto UMA logging into TranslateManager.

components/metrics/proto/translate_event.proto

 // Copyright 2016 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 translate UI, translate Ranekr and user interaction.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 option java_outer_classname = "TranslateEventProtos";
@@ skipping 93 matching lines @@
     // many times.
     LANGUAGE_DISABLED_BY_AUTO_BLACKLIST = 14;
     // The translation was not offered because Ranker dismissed it.
     DISABLED_BY_RANKER = 15;
     // The translation was not offered because the source or target
     // language is not supported.
     UNSUPPORTED_LANGUAGE = 16;
     // The translation was not offered because the URL is not
     // supported (e.g. New Tab Page).
     UNSUPPORTED_URL = 17;
+    // The previous page was in the same language, so the translate UI was
+    // suppressed.
+    MATCHES_PREVIOUS_LANGUAGE = 18;
+    // The translate UI was not shown because the browser window associated with
+    // the translate event has gone away.
+    BROWSER_WINDOW_IS_INVALID = 19;
+    // The translate UI was not shown because the browser window for the
+    // translate prompt is no longer active.
+    BROWSER_WINDOW_NOT_ACTIVE = 20;
+    // The translate UI was not shown because the browser window is minimized.
+    BROWSER_WINDOW_IS_MINIMIZED = 21;
+    // The translate UI was not shown because the web context for the translate
+    // prompt is no longer active.
+    WEB_CONTENTS_NOT_ACTIVE = 22;
+    // The translate UI was not shown because the user is editing a form field.
+    EDITABLE_FIELD_IS_ACTIVE = 23;
   }
 
   // Event received from translate UI.
   optional EventType event_type = 10;
 
   // The timestamp for the event, in seconds.
   // This value comes from Chromium's TimeTicks::Now(), which is an abstract
   // time value that is guaranteed to always be increasing (regardless of
   // Daylight Saving Time or any other changes to the system clock).
   // These numbers are only comparable within a session.  To sequence events
   // across sessions, order by the |session_id| from the
   // ChromeUserMetricsExtension message.
   optional int64 event_timestamp_sec = 11;
 
   // Modified source language, if the user changed it. If changed more than
   // once, we only keep the last one.
   optional string modified_source_language = 12;
   // Modified target language, if the user changed it. If changed more than
   // once, we only keep the last one.
   optional string modified_target_language = 13;
-}
+}