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

chrome/common/page_load_metrics/page_load_metrics_param_traits.cc

+// Copyright (c) 2017 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.
+
+#include "chrome/common/page_load_metrics/page_load_metrics_param_traits.h"
+
+#include "chrome/common/page_load_metrics/page_load_metrics_messages.h"
+#include "ipc/ipc_message_utils.h"
+
+namespace IPC {

[Bryan McQuade, 2017/05/12 19:49:26]

on looking at this more, i am wondering if we are better off in the end adding
generic ParamTraits for mojo::StructPtr<>. I'll defer to Ken on this but that
seems nicer to me.

+
+void ParamTraits<page_load_metrics::mojom::PageLoadTiming>::GetSize(

[Bryan McQuade, 2017/05/12 19:49:26]

the current impl, which i put together quickly, assumes / requires that the
child structs are non-null. this is fine for our code - we basically guarantee
this everywhere - but i'm not sure if IPC folks would prefer us to be defensive
here and handle null gracefully. will defer to ken and others on this.

+    base::PickleSizer* s,
+    const page_load_metrics::mojom::PageLoadTiming& timing) {
+  GetParamSize(s, timing.navigation_start);
+  GetParamSize(s, timing.response_start);
+  GetParamSize(s, *timing.document_timing);
+  GetParamSize(s, *timing.paint_timing);
+  GetParamSize(s, *timing.parse_timing);
+  GetParamSize(s, *timing.style_sheet_timing);
+}
+
+void ParamTraits<page_load_metrics::mojom::PageLoadTiming>::Write(
+    base::Pickle* m,
+    const page_load_metrics::mojom::PageLoadTiming& timing) {
+  if (!timing.document_timing || !timing.paint_timing || !timing.parse_timing ||
+      !timing.style_sheet_timing) {
+    // PageLoadTimings must have instances for all child struct members.
+    LOG(DFATAL) << "Received invalid PageLoadTiming.";
+    return;
+  }
+  WriteParam(m, timing.navigation_start);
+  WriteParam(m, timing.response_start);
+  WriteParam(m, *timing.document_timing);
+  WriteParam(m, *timing.paint_timing);
+  WriteParam(m, *timing.parse_timing);
+  WriteParam(m, *timing.style_sheet_timing);
+}
+
+bool ParamTraits<page_load_metrics::mojom::PageLoadTiming>::Read(
+    const base::Pickle* m,
+    base::PickleIterator* iter,
+    page_load_metrics::mojom::PageLoadTiming* timing) {
+  // Provide default instances of all child struct members, which we'll read
+  // into.
+  timing->document_timing = page_load_metrics::mojom::DocumentTiming::New();
+  timing->paint_timing = page_load_metrics::mojom::PaintTiming::New();
+  timing->parse_timing = page_load_metrics::mojom::ParseTiming::New();
+  timing->style_sheet_timing =
+      page_load_metrics::mojom::StyleSheetTiming::New();
+  return ReadParam(m, iter, &timing->navigation_start) &&
+         ReadParam(m, iter, &timing->response_start) &&
+         ReadParam(m, iter, timing->document_timing.get()) &&
+         ReadParam(m, iter, timing->paint_timing.get()) &&
+         ReadParam(m, iter, timing->parse_timing.get()) &&
+         ReadParam(m, iter, timing->style_sheet_timing.get());
+}
+
+void ParamTraits<page_load_metrics::mojom::PageLoadTiming>::Log(
+    const page_load_metrics::mojom::PageLoadTiming& timing,
+    std::string* l) {
+  l->append("PageLoadTiming(");
+  LogParam(timing.navigation_start, l);
+  l->append(",");
+  LogParam(timing.response_start, l);
+  l->append(",");
+
+  l->append("DocumentTiming(");
+  LogParam(timing.document_timing->dom_content_loaded_event_start, l);
+  l->append(",");
+  LogParam(timing.document_timing->load_event_start, l);
+  l->append(",");
+  LogParam(timing.document_timing->first_layout, l);
+  l->append(")");
+
+  l->append(",");
+
+  l->append("PaintTiming(");
+  LogParam(timing.paint_timing->first_paint, l);
+  l->append(",");
+  LogParam(timing.paint_timing->first_text_paint, l);
+  l->append(",");
+  LogParam(timing.paint_timing->first_image_paint, l);
+  l->append(",");
+  LogParam(timing.paint_timing->first_contentful_paint, l);
+  l->append(",");
+  LogParam(timing.paint_timing->first_meaningful_paint, l);
+  l->append(")");
+
+  l->append(",");
+
+  l->append("ParseTiming(");
+  LogParam(timing.parse_timing->parse_start, l);
+  l->append(",");
+  LogParam(timing.parse_timing->parse_stop, l);
+  l->append(",");
+  LogParam(timing.parse_timing->parse_blocked_on_script_load_duration, l);
+  l->append(",");
+  LogParam(timing.parse_timing
+               ->parse_blocked_on_script_load_from_document_write_duration,
+           l);
+  l->append(",");
+  LogParam(timing.parse_timing->parse_blocked_on_script_execution_duration, l);
+  l->append(",");
+  LogParam(timing.parse_timing
+               ->parse_blocked_on_script_execution_from_document_write_duration,
+           l);
+  l->append(")");
+
+  l->append(",");
+
+  l->append("StyleSheetTiming(");
+  LogParam(
+      timing.style_sheet_timing->author_style_sheet_parse_duration_before_fcp,
+      l);
+  l->append(",");
+  LogParam(timing.style_sheet_timing->update_style_duration_before_fcp, l);
+  l->append(")");
+
+  l->append(")");
+}
+
+}  // namespace IPC