[Cros SR Logging] Add a proto for search and ranking logging.

Proto with the features and related information to be logged for Chrome
OS Search and Ranking project.

Bug: 959705
Change-Id: I047dfc312d37862800fb3b48e5f30a98e85da254
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626837
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664009}

chrome/browser/ui/BUILD.gn

@@ -3348,6 +3348,7 @@ jumbo_split_static_library("ui") {
       "//ash/public/cpp/app_list/vector_icons",
       "//ash/resources/vector_icons",
       "//chrome/browser/ui:app_launch_event_logger_proto",
+      "//chrome/browser/ui/app_list/search/logging:search_ranking_event_proto",
       "//chrome/browser/ui/app_list/search/search_result_ranker:app_launch_predictor_proto",
       "//chrome/browser/ui/app_list/search/search_result_ranker:app_list_launch_recorder_proto",
       "//chrome/browser/ui/app_list/search/search_result_ranker:recurrence_ranker_proto",

chrome/browser/ui/app_list/search/logging/BUILD.gn

+# Copyright 2019 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.
+
+import("//third_party/protobuf/proto_library.gni")
+
+proto_library("search_ranking_event_proto") {
+  sources = [
+    "search_ranking_event.proto",
+  ]
+}

chrome/browser/ui/app_list/search/logging/search_ranking_event.proto

+// Copyright 2019 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.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package app_list;
+
+// Some enums that will be used for both SearchRankingZeroStateEvent and
+// SearchRankingQueryEvent.
+enum CategoryID {
+  UNKNOWN_CATEGORY_ID = 0;
+  ANSWER_CARD = 1;
+  RECENT_QUERY = 2;
+  WEB_RESULT = 3;
+  BOOKMARK = 4;
+  RECENTLY_VISITED_URL = 5;
+  DRIVE_FILE = 6;
+  LOCAL_FILE = 7;
+}
+
+enum FileExtension {
+  UNKNOWN_FILE_EXTENSION = 0;
+  DOCS = 1;
+  SHEETS = 2;
+  SLIDES = 3;
+  FORMS = 4;
+  DRAWINGS = 5;
+}
+
+enum DayOfWeek {
+  SUN = 0;
+  MON = 1;
+  TUE = 2;
+  WED = 3;
+  THU = 4;
+  FRI = 5;
+  SAT = 6;
+}
+
+enum DeviceMode {
+  CLAMSHELL = 0;
+  TABLET = 1;
+}
+
+// SearchRankingZeroStateEvent contains features and related information for the
+// Chrome OS Search and Ranking project. These will be used for zero-state
+// recommendations.
+message SearchRankingZeroStateEvent {
+  // Contain features about a specific item.
+  message Features {
+    // Type of the item.
+    optional CategoryID category_id = 1;
+    // Extension of the file. Only available if category_id is DRIVE_FILE or
+    // LOCAL_FILE.
+    optional FileExtension file_extension = 2;
+    // Day of the week. Sunday is 0.
+    optional DayOfWeek day_of_week = 3;
+    // Position of the item. Topmost is position 1.
+    optional int32 position = 4;
+    // Last usage time as hours since midnight in the local time zone. For
+    // previous queries, it is the time the user clicked on it on the
+    // same Chrome device.
+    optional int32 last_usage_time = 5;
+    // Time since the item was last used/clicked. This is a duration timestamp
+    // and will be in seconds.
+    optional int32 time_since_last_use = 6;
+    // Number of clicks each hour as bucketed by the hour.
+    optional int32 num_clicks_each_hour = 7;
+    // Physical device mode, e.g. TABLET, CLAMSHELL.
+    optional DeviceMode device_mode = 8;
+    // Bucketed previous query length
+    optional int32 query_length = 9;
+  }
+
+  // Information related to a specific event.
+  message Event {
+    // Identifier used to associate all recommended items that were shown to the
+    // user.
+    optional int32 event_id = 1;
+    // Event time as hours since midnight in the local time zone. This is
+    // absolute timestamp and will be in hours.
+    optional int32 event_time = 2;
+    // Whether the item is clicked.
+    optional bool is_clicked = 3;
+  }
+
+  optional Features features = 1;
+  optional Event event = 2;
+}