Migrate page_load_metrics out of components.

components/page_load_metrics/common/page_load_timing.h

-// Copyright 2015 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.
-
-#ifndef COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_
-#define COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_
-
-#include "base/optional.h"
-#include "base/time/time.h"
-#include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
-
-namespace page_load_metrics {
-
-// PageLoadTiming contains timing metrics associated with a page load. Many of
-// the metrics here are based on the Navigation Timing spec:
-// http://www.w3.org/TR/navigation-timing/.
-struct PageLoadTiming {
- public:
-  PageLoadTiming();
-  PageLoadTiming(const PageLoadTiming& other);
-  ~PageLoadTiming();
-
-  bool operator==(const PageLoadTiming& other) const;
-  bool operator!=(const PageLoadTiming& other) const {
-    return !(*this == other);
-  }
-
-  bool IsEmpty() const;
-
-  // Time that the navigation for the associated page was initiated.
-  base::Time navigation_start;
-
-  // All TimeDeltas are relative to navigation_start
-
-  // Time that the first byte of the response is received.
-  base::Optional<base::TimeDelta> response_start;
-
-  // Time that the document transitions to the 'loading' state. This is roughly
-  // the time that the HTML parser begins parsing the main HTML resource.
-  base::Optional<base::TimeDelta> dom_loading;
-
-  // Time immediately before the DOMContentLoaded event is fired.
-  base::Optional<base::TimeDelta> dom_content_loaded_event_start;
-
-  // Time immediately before the load event is fired.
-  base::Optional<base::TimeDelta> load_event_start;
-
-  // Time when the first layout is completed.
-  base::Optional<base::TimeDelta> first_layout;
-
-  // Time when the first paint is performed.
-  base::Optional<base::TimeDelta> first_paint;
-  // Time when the first non-blank text is painted.
-  base::Optional<base::TimeDelta> first_text_paint;
-  // Time when the first image is painted.
-  base::Optional<base::TimeDelta> first_image_paint;
-  // Time when the first contentful thing (image, text, etc.) is painted.
-  base::Optional<base::TimeDelta> first_contentful_paint;
-
-  // Time that the document's parser started and stopped parsing main resource
-  // content.
-  base::Optional<base::TimeDelta> parse_start;
-  base::Optional<base::TimeDelta> parse_stop;
-
-  // Sum of times when the parser is blocked waiting on the load of a script.
-  // This duration takes place between parser_start and parser_stop, and thus
-  // must be less than or equal to parser_stop - parser_start. Note that this
-  // value may be updated multiple times during the period between parse_start
-  // and parse_stop.
-  base::Optional<base::TimeDelta> parse_blocked_on_script_load_duration;
-
-  // Sum of times when the parser is blocked waiting on the load of a script
-  // that was inserted from document.write. This duration must be less than or
-  // equal to parse_blocked_on_script_load_duration. Note that this value may be
-  // updated multiple times during the period between parse_start and
-  // parse_stop. Note that some uncommon cases where scripts are loaded via
-  // document.write are not currently covered by this field. See crbug/600711
-  // for details.
-  base::Optional<base::TimeDelta>
-      parse_blocked_on_script_load_from_document_write_duration;
-
-  // If you add additional members, also be sure to update operator==,
-  // page_load_metrics_messages.h, and IsEmpty().
-};
-
-struct PageLoadMetadata {
-  PageLoadMetadata();
-  bool operator==(const PageLoadMetadata& other) const;
-  // These are packed blink::WebLoadingBehaviorFlag enums.
-  int behavior_flags = blink::WebLoadingBehaviorNone;
-};
-
-}  // namespace page_load_metrics
-
-#endif  // COMPONENTS_PAGE_LOAD_METRICS_COMMON_PAGE_LOAD_TIMING_H_