Bug 1911448 - Remove DOMContentFlushed. r=smaug,perftest-reviewers,sparky

As per comments in bug 1910411's patches and others, it's not a useful
metric, specially now that we have LCP and so on.

Actually there doesn't seem to be any consumer of it since bug 1892001.

Differential Revision: https://phabricator.services.mozilla.com/D218489

dom/base/Document.cpp

@@ -8376,9 +8376,6 @@ void Document::UnblockDOMContentLoaded() {
           ("DOCUMENT %p UnblockDOMContentLoaded", this));
 
   mDidFireDOMContentLoaded = true;
-  if (PresShell* presShell = GetPresShell()) {
-    presShell->GetRefreshDriver()->NotifyDOMContentLoaded();
-  }
 
   MOZ_ASSERT(mReadyState == READYSTATE_INTERACTIVE);
   if (!mSynchronousDOMContentLoaded) {

dom/base/nsDOMNavigationTiming.cpp

@@ -488,37 +488,6 @@ void nsDOMNavigationTiming::NotifyLargestContentfulRenderForRootContentDocument(
       mNavigationStart + TimeDuration::FromMilliseconds(aRenderTime);
 }
 
-void nsDOMNavigationTiming::NotifyDOMContentFlushedForRootContentDocument() {
-  MOZ_ASSERT(NS_IsMainThread());
-  MOZ_ASSERT(!mNavigationStart.IsNull());
-
-  if (!mDOMContentFlushed.IsNull()) {
-    return;
-  }
-
-  mDOMContentFlushed = TimeStamp::Now();
-
-  if (profiler_thread_is_being_profiled_for_markers() ||
-      PAGELOAD_LOG_ENABLED()) {
-    TimeDuration elapsed = mDOMContentFlushed - mNavigationStart;
-    nsPrintfCString marker(
-        "DOMContentFlushed after %dms for URL %s, %s",
-        int(elapsed.ToMilliseconds()),
-        nsContentUtils::TruncatedURLForDisplay(mLoadedURI).get(),
-        mDocShellHasBeenActiveSinceNavigationStart
-            ? "foreground tab"
-            : "this tab was inactive some of the time between navigation start "
-              "and DOMContentFlushed");
-    PAGELOAD_LOG(("%s", marker.get()));
-    PROFILER_MARKER_TEXT(
-        "DOMContentFlushed", DOM,
-        MarkerOptions(
-            MarkerTiming::Interval(mNavigationStart, mDOMContentFlushed),
-            MarkerInnerWindowIdFromDocShell(mDocShell)),
-        marker);
-  }
-}
-
 void nsDOMNavigationTiming::NotifyDocShellStateChanged(
     DocShellState aDocShellState) {
   mDocShellHasBeenActiveSinceNavigationStart &=
@@ -595,7 +564,6 @@ nsDOMNavigationTiming::nsDOMNavigationTiming(nsDocShell* aDocShell,
       mNavigationStart(aOther->mNavigationStart),
       mNonBlankPaint(aOther->mNonBlankPaint),
       mContentfulComposite(aOther->mContentfulComposite),
-      mDOMContentFlushed(aOther->mDOMContentFlushed),
       mBeforeUnloadStart(aOther->mBeforeUnloadStart),
       mUnloadStart(aOther->mUnloadStart),
       mUnloadEnd(aOther->mUnloadEnd),
@@ -629,7 +597,6 @@ void mozilla::ipc::IPDLParamTraits<nsDOMNavigationTiming*>::Write(
   WriteIPDLParam(aWriter, aActor, aParam->mNavigationStart);
   WriteIPDLParam(aWriter, aActor, aParam->mNonBlankPaint);
   WriteIPDLParam(aWriter, aActor, aParam->mContentfulComposite);
-  WriteIPDLParam(aWriter, aActor, aParam->mDOMContentFlushed);
   WriteIPDLParam(aWriter, aActor, aParam->mBeforeUnloadStart);
   WriteIPDLParam(aWriter, aActor, aParam->mUnloadStart);
   WriteIPDLParam(aWriter, aActor, aParam->mUnloadEnd);
@@ -669,7 +636,6 @@ bool mozilla::ipc::IPDLParamTraits<nsDOMNavigationTiming*>::Read(
       !ReadIPDLParam(aReader, aActor, &timing->mNavigationStart) ||
       !ReadIPDLParam(aReader, aActor, &timing->mNonBlankPaint) ||
       !ReadIPDLParam(aReader, aActor, &timing->mContentfulComposite) ||
-      !ReadIPDLParam(aReader, aActor, &timing->mDOMContentFlushed) ||
       !ReadIPDLParam(aReader, aActor, &timing->mBeforeUnloadStart) ||
       !ReadIPDLParam(aReader, aActor, &timing->mUnloadStart) ||
       !ReadIPDLParam(aReader, aActor, &timing->mUnloadEnd) ||

dom/base/nsDOMNavigationTiming.h

@@ -113,9 +113,6 @@ class nsDOMNavigationTiming final : public mozilla::RelativeTimeline {
     return TimeStampToDOM(mLargestContentfulRender);
   }
   DOMTimeMilliSec GetTimeToTTFI() const { return TimeStampToDOM(mTTFI); }
-  DOMTimeMilliSec GetTimeToDOMContentFlushed() const {
-    return TimeStampToDOM(mDOMContentFlushed);
-  }
 
   DOMHighResTimeStamp GetUnloadEventStartHighRes() {
     mozilla::TimeStamp stamp = GetUnloadEventStartTimeStamp();
@@ -182,7 +179,6 @@ class nsDOMNavigationTiming final : public mozilla::RelativeTimeline {
       const mozilla::TimeStamp& aCompositeEndTime);
   void NotifyLargestContentfulRenderForRootContentDocument(
       const DOMHighResTimeStamp& aRenderTime);
-  void NotifyDOMContentFlushedForRootContentDocument();
   void NotifyDocShellStateChanged(DocShellState aDocShellState);
 
   void MaybeAddLCPProfilerMarker(mozilla::MarkerInnerWindowId aInnerWindowID);
@@ -243,7 +239,6 @@ class nsDOMNavigationTiming final : public mozilla::RelativeTimeline {
   mozilla::TimeStamp mNonBlankPaint;
   mozilla::TimeStamp mContentfulComposite;
   mozilla::TimeStamp mLargestContentfulRender;
-  mozilla::TimeStamp mDOMContentFlushed;
 
   mozilla::TimeStamp mBeforeUnloadStart;
   mozilla::TimeStamp mUnloadStart;

dom/performance/PerformanceTiming.h

@@ -415,16 +415,6 @@ class PerformanceTiming final : public nsWrapperCache {
         mPerformance->GetRTPCallerType());
   }
 
-  DOMTimeMilliSec TimeToDOMContentFlushed() const {
-    if (!StaticPrefs::dom_enable_performance()) {
-      return 0;
-    }
-    return nsRFPService::ReduceTimePrecisionAsMSecs(
-        GetDOMTiming()->GetTimeToDOMContentFlushed(),
-        mPerformance->GetRandomTimelineSeed(),
-        mPerformance->GetRTPCallerType());
-  }
-
   DOMTimeMilliSec TimeToFirstInteractive() const {
     if (!StaticPrefs::dom_enable_performance()) {
       return 0;

dom/webidl/PerformanceTiming.webidl

@@ -44,12 +44,6 @@ interface PerformanceTiming {
   [Pref="dom.performance.time_to_contentful_paint.enabled"]
   readonly attribute unsigned long long timeToContentfulPaint;
 
-  // This is a Mozilla proprietary extension and not part of the
-  // performance/navigation timing specification. It marks the
-  // completion of the first presentation flush after DOMContentLoaded.
-  [Pref="dom.performance.time_to_dom_content_flushed.enabled"]
-  readonly attribute unsigned long long timeToDOMContentFlushed;
-
   // This is a Chrome proprietary extension and not part of the
   // performance/navigation timing specification.
   // Returns 0 if a time-to-interactive measurement has not happened.

layout/base/nsPresContext.cpp

@@ -2869,16 +2869,6 @@ void nsPresContext::NotifyPaintStatusReset() {
   mHadNonTickContentfulPaint = false;
 }
 
-void nsPresContext::NotifyDOMContentFlushed() {
-  NS_ENSURE_TRUE_VOID(mPresShell);
-  if (IsRootContentDocumentCrossProcess()) {
-    RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
-    if (timing) {
-      timing->NotifyDOMContentFlushedForRootContentDocument();
-    }
-  }
-}
-
 nscoord nsPresContext::GfxUnitsToAppUnits(gfxFloat aGfxUnits) const {
   return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits);
 }

layout/base/nsPresContext.h

@@ -1040,7 +1040,6 @@ class nsPresContext : public nsISupports, public mozilla::SupportsWeakPtr {
   void NotifyNonBlankPaint();
   void NotifyContentfulPaint();
   void NotifyPaintStatusReset();
-  void NotifyDOMContentFlushed();
 
   bool HasEverBuiltInvisibleText() const { return mHasEverBuiltInvisibleText; }
   void SetBuiltInvisibleText() { mHasEverBuiltInvisibleText = true; }

layout/base/nsRefreshDriver.cpp

@@ -1363,7 +1363,6 @@ nsRefreshDriver::nsRefreshDriver(nsPresContext* aPresContext)
       mWaitingForTransaction(false),
       mSkippedPaints(false),
       mResizeSuppressed(false),
-      mNotifyDOMContentFlushed(false),
       mNeedToUpdateIntersectionObservations(false),
       mNeedToUpdateResizeObservers(false),
       mNeedToRunFrameRequestCallbacks(false),
@@ -1638,21 +1637,6 @@ void nsRefreshDriver::RemoveImageRequest(imgIRequest* aRequest) {
   }
 }
 
-void nsRefreshDriver::NotifyDOMContentLoaded() {
-  // If the refresh driver is going to tick, we mark the timestamp after
-  // everything is flushed in the next tick. If it isn't, mark ourselves as
-  // flushed now.
-  if (!HasReasonsToTick()) {
-    if (nsPresContext* pc = GetPresContext()) {
-      pc->NotifyDOMContentFlushed();
-    }
-    // else, we don't have a nsPresContext, so our doc is probably being
-    // destroyed and this notification doesn't need sending anyway.
-  } else {
-    mNotifyDOMContentFlushed = true;
-  }
-}
-
 void nsRefreshDriver::RegisterCompositionPayload(
     const mozilla::layers::CompositionPayload& aPayload) {
   mCompositionPayloads.AppendElement(aPayload);
@@ -2889,11 +2873,6 @@ void nsRefreshDriver::Tick(VsyncId aId, TimeStamp aNowTime,
                                  static_cast<uint32_t>(totalMs));
 #endif
 
-  if (mNotifyDOMContentFlushed) {
-    mNotifyDOMContentFlushed = false;
-    mPresContext->NotifyDOMContentFlushed();
-  }
-
   for (nsAPostRefreshObserver* observer :
        mPostRefreshObservers.ForwardRange()) {
     observer->DidRefresh();

layout/base/nsRefreshDriver.h

@@ -371,8 +371,6 @@ class nsRefreshDriver final : public mozilla::layers::TransactionIdAllocator,
   static void DispatchIdleTaskAfterTickUnlessExists(mozilla::Task* aTask);
   static void CancelIdleTask(mozilla::Task* aTask);
 
-  void NotifyDOMContentLoaded();
-
   // Schedule a refresh so that any delayed events will run soon.
   void RunDelayedEventsSoon();
 
@@ -636,9 +634,6 @@ class nsRefreshDriver final : public mozilla::layers::TransactionIdAllocator,
   // start of every tick.
   bool mResizeSuppressed : 1;
 
-  // True if the next tick should notify DOMContentFlushed.
-  bool mNotifyDOMContentFlushed : 1;
-
   // True if we need to flush in order to update intersection observations in
   // all our documents.
   bool mNeedToUpdateIntersectionObservations : 1;

modules/libpref/init/StaticPrefList.yaml

@@ -3349,12 +3349,6 @@
   value: false
   mirror: always
 
-# Is support for PerformanceTiming.timeToDOMContentFlushed enabled?
-- name: dom.performance.time_to_dom_content_flushed.enabled
-  type: bool
-  value: false
-  mirror: always
-
 # Is support for PerformanceTiming.timeToFirstInteractive enabled?
 - name: dom.performance.time_to_first_interactive.enabled
   type: bool

testing/profiles/raptor/user.js

@@ -13,7 +13,6 @@ user_pref("browser.tabs.hideStatusPanel", true);
 
 user_pref("dom.performance.time_to_non_blank_paint.enabled", true);
 user_pref("dom.performance.time_to_contentful_paint.enabled", true);
-user_pref("dom.performance.time_to_dom_content_flushed.enabled", false);
 user_pref("dom.performance.time_to_first_interactive.enabled", true);
 
 // required for geckoview logging