Sending a data saver Pageload metrics pingback

components/data_reduction_proxy/proto/pageload_metrics.proto

Index: components/data_reduction_proxy/proto/pageload_metrics.proto
diff --git a/components/data_reduction_proxy/proto/pageload_metrics.proto b/components/data_reduction_proxy/proto/pageload_metrics.proto
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+// 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.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+import "client_config.proto";
+
+package data_reduction_proxy;
+
+// Request message to record metrics for one or more pageloads.
+message RecordPageloadMetricsRequest {
+  // The pageload metrics to record.
+  repeated PageloadMetrics pageloads = 1;
+}
+
+// Metrics for a single pageload.
+message PageloadMetrics {
+  // The session key used to load the page.
+  optional string session_key = 1;
+  // The time at which the first request of the pageload was made, according to
+  // the client's clock.
+  optional Timestamp first_request_time = 2;
+  // The time at which the last request of the pageload was made, according to
+  // the client's clock.
+  optional Timestamp last_request_time = 3;
+  // The URL of the main page request.
+  optional string first_request_url = 4;
+  // The URL of the last request.
+  optional string last_request_url = 5;
+
+  // Time to first contentful paint.
+  optional Duration time_to_first_contentful_paint = 6;
+  // Time to first image paint.
+  optional Duration time_to_first_image_paint = 7;
+  // Time to first byte.
+  optional Duration time_to_first_byte = 8;
+  // Time to onLoad event.
+  optional Duration page_load_time = 9;
+
+  // The sum of original-content-length values, over resources that were not
+  // loaded from browser cache.
+  optional int32 original_page_size_bytes = 10;
+  // The sum of (compressed) content-length, over resources that were not loaded
+  // from browser cache.
+  optional int32 compressed_page_size_bytes = 11;
+}