Bug 1590763 - Record the async open time for DocumentChannel in the content process, since consumers expect this to be the same as the navigation start. r=mayhemer

Differential Revision: https://phabricator.services.mozilla.com/D50894

--HG--
extra : moz-landing-system : lando

netwerk/ipc/DocumentChannelChild.cpp

@@ -68,6 +68,7 @@ DocumentChannelChild::DocumentChannelChild(
   uint64_t channelId;
   Unused << handler->NewChannelId(channelId);
   mChannelId.emplace(channelId);
+  mAsyncOpenTime = TimeStamp::Now();
 }
 
 NS_IMETHODIMP
@@ -151,6 +152,7 @@ DocumentChannelChild::AsyncOpen(nsIStreamListener* aListener) {
   args.isTopLevelDoc() = mIsTopLevelDoc;
   args.hasNonEmptySandboxingFlags() = mHasNonEmptySandboxingFlags;
   args.channelId() = *mChannelId;
+  args.asyncOpenTime() = mAsyncOpenTime;
 
   nsCOMPtr<nsILoadContext> loadContext;
   NS_QueryNotificationCallbacks(this, loadContext);

netwerk/ipc/DocumentChannelChild.h

@@ -115,6 +115,7 @@ class DocumentChannelChild final : public PDocumentChannelChild,
 
   RedirectToRealChannelResolver mRedirectResolver;
 
+  TimeStamp mAsyncOpenTime;
   const RefPtr<nsDocShellLoadState> mLoadState;
   const Maybe<nsString> mInitiatorType;
   const uint32_t mLoadType;

netwerk/ipc/DocumentChannelParent.cpp

@@ -122,6 +122,11 @@ bool DocumentChannelParent::Init(const DocumentChannelCreationArgs& aArgs) {
     httpChannelImpl->SetWarningReporter(this);
   }
 
+  nsCOMPtr<nsITimedChannel> timedChannel = do_QueryInterface(mChannel);
+  if (timedChannel) {
+    timedChannel->SetAsyncOpen(aArgs.asyncOpenTime());
+  }
+
   // Setup a ClientChannelHelper to watch for redirects, and copy
   // across any serviceworker related data between channels as needed.
   AddClientChannelHelperInParent(mChannel, GetMainThreadSerialEventTarget());

netwerk/ipc/NeckoChannelParams.ipdlh

@@ -357,6 +357,7 @@ struct DocumentChannelCreationArgs {
   DocShellLoadStateInit loadState;
   LoadInfoArgs loadInfo;
   PrincipalInfo? contentBlockingAllowListPrincipal;
+  TimeStamp asyncOpenTime;
   nsString? initiatorType;
   nsString customUserAgent;
   uint64_t channelId;