DevTools - network - implement the secureConnectionStart property for the PerformanceTiming

https://github.com/MoonchildProductions/moebius/pull/116
("/testing" and "/toolkit" in in the previous commit)

dom/performance/PerformanceMainThread.cpp

@@ -200,7 +200,7 @@ PerformanceMainThread::IsPerformanceTimingAttribute(const nsAString& aName)
   static const char* attributes[] =
     {"navigationStart", "unloadEventStart", "unloadEventEnd", "redirectStart",
      "redirectEnd", "fetchStart", "domainLookupStart", "domainLookupEnd",
-     "connectStart", "connectEnd", "requestStart", "responseStart",
+     "connectStart", "secureConnectionStart", "connectEnd", "requestStart", "responseStart",
      "responseEnd", "domLoading", "domInteractive",
      "domContentLoadedEventStart", "domContentLoadedEventEnd", "domComplete",
      "loadEventStart", "loadEventEnd", nullptr};
@@ -249,6 +249,9 @@ PerformanceMainThread::GetPerformanceTimingFromString(const nsAString& aProperty
   if (aProperty.EqualsLiteral("connectStart")) {
     return Timing()->ConnectStart();
   }
+  if (aProperty.EqualsLiteral("secureConnectionStart")) {
+    return Timing()->SecureConnectionStart();
+  }
   if (aProperty.EqualsLiteral("connectEnd")) {
     return Timing()->ConnectEnd();
   }

dom/performance/PerformanceResourceTiming.h

@@ -128,9 +128,9 @@ public:
 
   DOMHighResTimeStamp SecureConnectionStart() const
   {
-    // This measurement is not available for Navigation Timing either.
-    // There is a different bug submitted for it.
-    return 0;
+    return mTiming && mTiming->TimingAllowed()
+        ? mTiming->SecureConnectionStartHighRes()
+        : 0;
   }
 
   virtual const PerformanceResourceTiming* ToResourceTiming() const override

dom/performance/PerformanceTiming.cpp

@@ -63,12 +63,40 @@ PerformanceTiming::InitializeTimingInfo(nsITimedChannel* aChannel)
     aChannel->GetDomainLookupStart(&mDomainLookupStart);
     aChannel->GetDomainLookupEnd(&mDomainLookupEnd);
     aChannel->GetConnectStart(&mConnectStart);
+    aChannel->GetSecureConnectionStart(&mSecureConnectionStart);
     aChannel->GetConnectEnd(&mConnectEnd);
     aChannel->GetRequestStart(&mRequestStart);
     aChannel->GetResponseStart(&mResponseStart);
     aChannel->GetCacheReadStart(&mCacheReadStart);
     aChannel->GetResponseEnd(&mResponseEnd);
     aChannel->GetCacheReadEnd(&mCacheReadEnd);
+
+    // the performance timing api essentially requires that the event timestamps
+    // are >= asyncOpen().. but in truth the browser engages in a number of
+    // speculative activities that sometimes mean connections and lookups begin
+    // earlier. Workaround that here by just using asyncOpen as the minimum
+    // timestamp for dns and connection info.
+    if (!mAsyncOpen.IsNull()) {
+      if (!mDomainLookupStart.IsNull() && mDomainLookupStart < mAsyncOpen) {
+        mDomainLookupStart = mAsyncOpen;
+      }
+
+      if (!mDomainLookupEnd.IsNull() && mDomainLookupEnd < mAsyncOpen) {
+        mDomainLookupEnd = mAsyncOpen;
+      }
+
+      if (!mConnectStart.IsNull() && mConnectStart < mAsyncOpen) {
+        mConnectStart = mAsyncOpen;
+      }
+
+      if (!mSecureConnectionStart.IsNull() && mSecureConnectionStart < mAsyncOpen) {
+        mSecureConnectionStart = mAsyncOpen;
+      }
+
+      if (!mConnectEnd.IsNull() && mConnectEnd < mAsyncOpen) {
+        mConnectEnd = mAsyncOpen;
+      }
+    }
   }
 }
 
@@ -273,6 +301,22 @@ PerformanceTiming::ConnectStart()
   return static_cast<int64_t>(ConnectStartHighRes());
 }
 
+DOMHighResTimeStamp
+PerformanceTiming::SecureConnectionStartHighRes()
+{
+  if (!nsContentUtils::IsPerformanceTimingEnabled() || !IsInitialized()) {
+    return mZeroTime;
+  }
+  return mSecureConnectionStart.IsNull() ? mZeroTime
+                                         : TimeStampToDOMHighRes(mSecureConnectionStart);
+}
+
+DOMTimeMilliSec
+PerformanceTiming::SecureConnectionStart()
+{
+  return static_cast<int64_t>(SecureConnectionStartHighRes());
+}
+
 DOMHighResTimeStamp
 PerformanceTiming::ConnectEndHighRes()
 {

dom/performance/PerformanceTiming.h

@@ -161,6 +161,7 @@ public:
   DOMHighResTimeStamp DomainLookupStartHighRes();
   DOMHighResTimeStamp DomainLookupEndHighRes();
   DOMHighResTimeStamp ConnectStartHighRes();
+  DOMHighResTimeStamp SecureConnectionStartHighRes();
   DOMHighResTimeStamp ConnectEndHighRes();
   DOMHighResTimeStamp RequestStartHighRes();
   DOMHighResTimeStamp ResponseStartHighRes();
@@ -173,6 +174,7 @@ public:
   DOMTimeMilliSec DomainLookupStart();
   DOMTimeMilliSec DomainLookupEnd();
   DOMTimeMilliSec ConnectStart();
+  DOMTimeMilliSec SecureConnectionStart();
   DOMTimeMilliSec ConnectEnd();
   DOMTimeMilliSec RequestStart();
   DOMTimeMilliSec ResponseStart();
@@ -255,6 +257,7 @@ private:
   TimeStamp mDomainLookupStart;
   TimeStamp mDomainLookupEnd;
   TimeStamp mConnectStart;
+  TimeStamp mSecureConnectionStart;
   TimeStamp mConnectEnd;
   TimeStamp mRequestStart;
   TimeStamp mResponseStart;