Migrate page_load_metrics out of components.

components/page_load_metrics/renderer/metrics_render_frame_observer.cc

-// 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.
-
-#include "components/page_load_metrics/renderer/metrics_render_frame_observer.h"
-
-#include <string>
-
-#include "base/memory/ptr_util.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-#include "components/page_load_metrics/renderer/page_timing_metrics_sender.h"
-#include "content/public/renderer/render_frame.h"
-#include "third_party/WebKit/public/platform/WebURLResponse.h"
-#include "third_party/WebKit/public/web/WebDataSource.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
-#include "third_party/WebKit/public/web/WebLocalFrame.h"
-#include "third_party/WebKit/public/web/WebPerformance.h"
-#include "url/gurl.h"
-
-namespace page_load_metrics {
-
-namespace {
-
-base::TimeDelta ClampDelta(double event, double start) {
-  if (event - start < 0)
-    event = start;
-  return base::Time::FromDoubleT(event) - base::Time::FromDoubleT(start);
-}
-
-}  //  namespace
-
-MetricsRenderFrameObserver::MetricsRenderFrameObserver(
-    content::RenderFrame* render_frame)
-    : content::RenderFrameObserver(render_frame) {}
-
-MetricsRenderFrameObserver::~MetricsRenderFrameObserver() {}
-
-void MetricsRenderFrameObserver::DidChangePerformanceTiming() {
-  SendMetrics();
-}
-
-void MetricsRenderFrameObserver::DidObserveLoadingBehavior(
-    blink::WebLoadingBehaviorFlag behavior) {
-  if (page_timing_metrics_sender_)
-    page_timing_metrics_sender_->DidObserveLoadingBehavior(behavior);
-}
-
-void MetricsRenderFrameObserver::DidCommitProvisionalLoad(
-    bool is_new_navigation,
-    bool is_same_page_navigation) {
-  // Same-page navigations (e.g. an in-document navigation from a fragment
-  // link) aren't full page loads, since they don't go to network to load the
-  // main HTML resource. DidStartProvisionalLoad doesn't get invoked for same
-  // page navigations, so we may still have an active
-  // page_timing_metrics_sender_ at this point.
-  if (is_same_page_navigation)
-    return;
-
-  // Make sure to release the sender for a previous navigation, if we have one.
-  page_timing_metrics_sender_.reset();
-
-  // We only create a PageTimingMetricsSender if the page meets the criteria for
-  // sending and recording metrics. Once page_timing_metrics_sender_ is
-  // non-null, we will send metrics for the current page at some later time, as
-  // those metrics become available.
-  if (ShouldSendMetrics()) {
-    PageLoadTiming timing(GetTiming());
-    DCHECK(!timing.navigation_start.is_null());
-    page_timing_metrics_sender_.reset(
-        new PageTimingMetricsSender(this, routing_id(), CreateTimer(), timing));
-  }
-}
-
-void MetricsRenderFrameObserver::SendMetrics() {
-  if (!page_timing_metrics_sender_)
-    return;
-  if (HasNoRenderFrame())
-    return;
-  PageLoadTiming timing(GetTiming());
-  page_timing_metrics_sender_->Send(timing);
-}
-
-bool MetricsRenderFrameObserver::ShouldSendMetrics() const {
-  if (HasNoRenderFrame())
-    return false;
-  const blink::WebLocalFrame* frame = render_frame()->GetWebFrame();
-  // We only generate historgrams for main frames.
-  if (frame->parent())
-    return false;
-
-  const blink::WebDocument& document = frame->document();
-  // Ignore non-HTTP schemes (e.g. chrome://).
-  const GURL& url = document.url();
-  if (!url.SchemeIsHTTPOrHTTPS())
-    return false;
-
-  const blink::WebURLResponse& url_response = frame->dataSource()->response();
-
-  // Ignore non-HTML documents (e.g. SVG). Note that images are treated by
-  // Blink as HTML documents, so to exclude images, we must perform
-  // additional mime type checking below.
-  if (!document.isHTMLDocument() && !document.isXHTMLDocument())
-    return false;
-
-  // Ignore non-HTML mime types (e.g. images).
-  std::string mime_type = url_response.mimeType().utf8();
-  if (mime_type != "text/html" && mime_type != "application/xhtml+xml")
-    return false;
-
-  return true;
-}
-
-PageLoadTiming MetricsRenderFrameObserver::GetTiming() const {
-  const blink::WebPerformance& perf =
-      render_frame()->GetWebFrame()->performance();
-
-  PageLoadTiming timing;
-  double start = perf.navigationStart();
-  timing.navigation_start = base::Time::FromDoubleT(start);
-  if (perf.responseStart() > 0.0)
-    timing.response_start = ClampDelta(perf.responseStart(), start);
-  if (perf.domLoading() > 0.0)
-    timing.dom_loading = ClampDelta(perf.domLoading(), start);
-  if (perf.domContentLoadedEventStart() > 0.0)
-    timing.dom_content_loaded_event_start =
-        ClampDelta(perf.domContentLoadedEventStart(), start);
-  if (perf.loadEventStart() > 0.0)
-    timing.load_event_start = ClampDelta(perf.loadEventStart(), start);
-  if (perf.firstLayout() > 0.0)
-    timing.first_layout = ClampDelta(perf.firstLayout(), start);
-  if (perf.firstPaint() > 0.0)
-    timing.first_paint = ClampDelta(perf.firstPaint(), start);
-  if (perf.firstTextPaint() > 0.0)
-    timing.first_text_paint = ClampDelta(perf.firstTextPaint(), start);
-  if (perf.firstImagePaint() > 0.0)
-    timing.first_image_paint = ClampDelta(perf.firstImagePaint(), start);
-  if (perf.firstContentfulPaint() > 0.0)
-    timing.first_contentful_paint =
-        ClampDelta(perf.firstContentfulPaint(), start);
-  if (perf.parseStart() > 0.0)
-    timing.parse_start = ClampDelta(perf.parseStart(), start);
-  if (perf.parseStop() > 0.0)
-    timing.parse_stop = ClampDelta(perf.parseStop(), start);
-  if (timing.parse_start) {
-    // If we started parsing, record all parser durations such as the amount of
-    // time blocked on script load, even if those values are zero.
-    timing.parse_blocked_on_script_load_duration =
-        base::TimeDelta::FromSecondsD(perf.parseBlockedOnScriptLoadDuration());
-    timing.parse_blocked_on_script_load_from_document_write_duration =
-        base::TimeDelta::FromSecondsD(
-            perf.parseBlockedOnScriptLoadFromDocumentWriteDuration());
-  }
-  return timing;
-}
-
-std::unique_ptr<base::Timer> MetricsRenderFrameObserver::CreateTimer() const {
-  return base::WrapUnique(new base::OneShotTimer);
-}
-
-bool MetricsRenderFrameObserver::HasNoRenderFrame() const {
-  bool no_frame = !render_frame() || !render_frame()->GetWebFrame();
-  DCHECK(!no_frame);
-  return no_frame;
-}
-
-void MetricsRenderFrameObserver::OnDestruct() {
-  delete this;
-}
-
-}  // namespace page_load_metrics