[Page Load Metrics] Add mojom file to page load metrics.

chrome/common/page_load_metrics/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 CHROME_COMMON_PAGE_LOAD_METRICS_PAGE_LOAD_TIMING_H_
 #define CHROME_COMMON_PAGE_LOAD_METRICS_PAGE_LOAD_TIMING_H_
 
 #include "base/optional.h"
 #include "base/time/time.h"
+#include "chrome/common/page_load_metrics/page_load_metrics.mojom.h"
 #include "third_party/WebKit/public/platform/WebLoadingBehaviorFlag.h"
 
 namespace page_load_metrics {
 
-struct DocumentTiming {
-  DocumentTiming();
-  DocumentTiming(const DocumentTiming& other);
-  ~DocumentTiming();
+// Initialize an empty PageLoadTiming with initialized empty sub-members.
+mojo::StructPtr<mojom::PageLoadTiming> CreatePageLoadTiming();
 
-  bool operator==(const DocumentTiming& other) const;
-  bool operator!=(const DocumentTiming& other) const {
-    return !(*this == other);
-  }
+bool IsEmpty(const mojom::DocumentTiming& timing);

[Ken Rockot(use gerrit already), 2017/05/15 17:26:34]

This pattern makes me sad, but I defer to page_load_metrics owners

[Bryan McQuade, 2017/05/15 17:34:08]

what about it makes you sad? happy to try to address concerns if we can. we do
need some way to know if these structs are "empty".

+bool IsEmpty(const mojom::PaintTiming& timing);
+bool IsEmpty(const mojom::ParseTiming& timing);
+bool IsEmpty(const mojom::StyleSheetTiming& timing);
+bool IsEmpty(const mojom::PageLoadTiming& timing);
 
-  bool IsEmpty() const;
-
-  // TimeDeltas below relative to navigation start:
-
-  // 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;
-};
-
-struct PaintTiming {
-  PaintTiming();
-  PaintTiming(const PaintTiming& other);
-  ~PaintTiming();
-
-  bool operator==(const PaintTiming& other) const;
-  bool operator!=(const PaintTiming& other) const { return !(*this == other); }
-
-  bool IsEmpty() const;
-
-  // TimeDeltas below relative to navigation start:
-
-  // 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;
-  // (Experimental) Time when the page's primary content is painted.
-  base::Optional<base::TimeDelta> first_meaningful_paint;
-};
-
-struct ParseTiming {
-  ParseTiming();
-  ParseTiming(const ParseTiming& other);
-  ~ParseTiming();
-
-  bool operator==(const ParseTiming& other) const;
-  bool operator!=(const ParseTiming& other) const { return !(*this == other); }
-
-  bool IsEmpty() const;
-
-  // TimeDeltas below represent durations of time during the page load:
-
-  // 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;
-
-  // Sum of times when the parser is executing 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_execution_duration;
-
-  // Sum of times when the parser is executing 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_execution_from_document_write_duration;
-};
-
-struct StyleSheetTiming {
-  StyleSheetTiming();
-  StyleSheetTiming(const StyleSheetTiming& other);
-  ~StyleSheetTiming();
-
-  bool operator==(const StyleSheetTiming& other) const;
-  bool operator!=(const StyleSheetTiming& other) const {
-    return !(*this == other);
-  }
-
-  bool IsEmpty() const;
-
-  // Total time spent parsing author style sheets, before the first contentful
-  // paint.
-  base::Optional<base::TimeDelta> author_style_sheet_parse_duration_before_fcp;
-
-  // Time spent in Document::updateStyle before FCP.
-  base::Optional<base::TimeDelta> update_style_duration_before_fcp;
-};
-
-// 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. Note that
-  // this field is only used for internal tracking purposes and should not be
-  // used by PageLoadMetricsObservers. This field will likely be removed in the
-  // future.
-  base::Time navigation_start;
-
-  // Time relative to navigation_start that the first byte of the response is
-  // received.
-  base::Optional<base::TimeDelta> response_start;
-
-  DocumentTiming document_timing;
-  PaintTiming paint_timing;
-  ParseTiming parse_timing;
-  StyleSheetTiming style_sheet_timing;
-
-  // 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::kWebLoadingBehaviorNone;
-};
+void InitPageLoadTimingForTest(mojom::PageLoadTiming* timing);
 
 }  // namespace page_load_metrics
 
 #endif  // CHROME_COMMON_PAGE_LOAD_METRICS_PAGE_LOAD_TIMING_H_