Export UMA protos with proto_export.py.

Change-Id: I88779743e8ac04ea0883a91fc9b61297c758e67f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1950375Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723640}

third_party/metrics_proto/BUILD.gn

@@ -24,6 +24,7 @@ _proto_files = [
   "printer_event.proto",
   "reporting_info.proto",
   "sampled_profile.proto",
+  "structured_event.proto",
   "system_profile.proto",
   "trace_log.proto",
   "translate_event.proto",

third_party/metrics_proto/README.chromium

 Name: Metrics Protos
 Short Name: metrics_proto
 URL: This is the canonical public repository
-Version: 277734544
-Date: 2019/10/31 UTC
+Version: 283899508
+Date: 2019/12/05 UTC
 License: BSD
 Security Critical: Yes
 

third_party/metrics_proto/chrome_user_metrics_extension.proto

@@ -20,13 +20,14 @@ import "perf_data.proto";
 import "printer_event.proto";
 import "reporting_info.proto";
 import "sampled_profile.proto";
+import "structured_event.proto";
 import "system_profile.proto";
 import "trace_log.proto";
 import "translate_event.proto";
 import "user_action_event.proto";
 import "user_demographics.proto";
 
-// Next tag: 22
+// Next tag: 23
 message ChromeUserMetricsExtension {
   // The product (i.e. end user application) for a given UMA log.
   enum Product {
@@ -81,6 +82,8 @@ message ChromeUserMetricsExtension {
   repeated PrinterEventProto printer_event = 16;
   repeated ChromeOSAppListLaunchEventProto chrome_os_app_list_launch_event = 20;
 
+  repeated StructuredEventProto structured_event = 22;
+
   // Deprecated: use |sampled_profile| instead.
   repeated PerfDataProto perf_data = 8 [deprecated = true];
 

third_party/metrics_proto/structured_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 metrics;
+
+// One structured metrics event, containing several hashed and unhashed metrics
+// related to a single event type, tied to a single pseudonymous user.
+//
+// Next tag: 4
+message StructuredEventProto {
+  // A per-profile, per-client, per-event ID that is used only for structured
+  // metrics.
+  optional fixed64 profile_event_id = 1;
+
+  // The first 8 bytes of the MD5 hash of the event's name as a string. Each
+  // name is defined in src/tools/metrics/structured/structured.xml, and this
+  // will be the hash of one of those.
+  optional fixed64 event_name_hash = 2;
+
+  // All metric values for this event. Each metric has two properties defined in
+  // structured.xml that determine what is recorded.
+  //
+  // 1. Metric name. This is a string, and the first 8 bytes of its MD5 hash is
+  //    recorded as name_hash.
+  //
+  // 2. Kind. Each metric can store two kinds of values.
+  //
+  //    - int64. The client supplies an int64 value for the metric, and that
+  //      value is recorded as-is in value_raw.
+  //
+  //    - hashed-string. The client supplies an arbitrary string for the metric.
+  //      The string itself is not recorded, instead, value_hmac records the
+  //      first 8 bytes of:
+  //
+  //          HMAC_SHA256(concat(string, metric_name), event_key)
+  //
+  //      The event_key is a per-profile, per-client, per-event secret 32-byte
+  //      key used only for signing hashed values for this event. Keys should
+  //      never leave the device, and are rotated at most every 90 days.
+  message Metric {
+    optional fixed64 name_hash = 1;
+    oneof value {
+      fixed64 value_hmac = 2;
+      int64 value_int64 = 3;
+    }
+  }
+  repeated Metric metrics = 3;
+}

third_party/metrics_proto/system_profile.proto

@@ -1070,6 +1070,7 @@ message SystemProfileProto {
     CELLULAR = 23;
     DEMO_MODE_RESOURCES = 24;
     ON_DEVICE_HEAD_SUGGEST = 25;
+    CROS_SMART_DIM = 26;
   }
 
   // Information about what Chrome components are registered and at which