Add TranslateEventProto to UMA metrics

components/metrics/proto/translate_event.proto

Index: components/metrics/proto/translate_event.proto
diff --git a/components/metrics/proto/translate_event.proto b/components/metrics/proto/translate_event.proto
new file mode 100644
index 0000000000000000000000000000000000000000..8dae1b0c01063fc26b7c52d330bfcd0a2b4da1d6
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+++ b/components/metrics/proto/translate_event.proto
@@ -0,0 +1,134 @@
+// 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";
+option java_package = "org.chromium.components.metrics";
+
+package metrics;
+
+// Stores information about a single interaction between a user and
+// the Translate UI. Contains features used by Translate Ranker for
+// inference, information about the ranker model and its decision, as
+// well as user or automated feedback from the Translate UI.
+// Next tag: 14
+message TranslateEventProto {
+  // Language strings are two or three letter codes, with sometimes an extra
+  // suffix (for e.g. chinese zh-TW or zh-CN). See
+  // https://cs.chromium.org/chromium/src/components/translate/core/browser/translate_language_list.cc
+  // for a list of supported languages.
+  // Source language of the translation.
+  optional string source_language = 1;
+  // Target language of the translation.
+  optional string target_language = 2;
+
+  // The following counts are extracted from TranslatePrefs.
+  // The number of times the user accepted a translation for the
+  // source language.
+  optional int32 accept_count = 3;
+  // The number of times the user declined a translation for the
+  // source language.
+  optional int32 decline_count = 4;
+  // The number of times the user ignored a translation for the source
+  // language.
+  optional int32 ignore_count = 5;
+
+  // Language list from the language settings. These are languages the user
+  // explicitly set in the language settings.
+  repeated string language_list = 6;
+
+  // The version of the translate ranker model.
+  optional uint32 ranker_version = 7;
+
+  // Timestamp of when the Ranker was queried, 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 ranker_request_timestamp_sec = 8;
+
+  // The decision of translate ranker whether we should show the UI or not.
+  enum RankerResponse {
+    SHOW = 0;
+    DONT_SHOW = 1;
+    NOT_QUERIED = 2;
+  }
+  optional RankerResponse ranker_response = 9;
+
+  // The action performed by the user in the translate UI.
+  enum EventType {
+    // The feedback event does not correspond to any of the enumerated
+    // cases.
+    UNKNOWN = 0;
+
+    // User actions.
+    // The user clicked 'Nope' in the UI.
+    USER_DECLINE = 1;
+    // The user clicked 'Translate' in the UI.
+    USER_ACCEPT = 2;
+    // The user explicitly closed the UI.
+    USER_DISMISS = 3;
+    // The user ignored the UI.
+    USER_IGNORE = 4;
+    // The user asked to never translate this source language.
+    USER_NEVER_TRANSLATE_LANGUAGE = 5;
+    // The user asked to never translate on this site.
+    USER_NEVER_TRANSLATE_SITE = 6;
+    // The user asked to always translate this source language.
+    USER_ALWAYS_TRANSLATE_LANGUAGE = 7;
+    // The user explicitly asked for a translation from the context menu.
+    USER_CONTEXT_MENU_TRANSLATE = 8;
+    // The user reverted the translation.
+    USER_REVERT = 9;
+
+    // Automated feedback.
+    // An automatic translation was triggered.
+    AUTOMATICALLY_TRANSLATED = 10;
+    // The translation was not offered because translate is disabled
+    // globally in the user preferences.
+    DISABLED_BY_PREF = 11;
+    // The translation was not offered because this language is
+    // blacklisted in the user config.
+    LANGUAGE_DISABLED_BY_USER_CONFIG = 12;
+    // The translation was not offered because this language or URL is
+    // blacklisted in the user config.
+    URL_DISABLED_BY_USER_CONFIG = 13;
+    // The translation was not offered because this language has been denied too
+    // 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;
+  }
+
+  // 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;
+}