Bug 1403926 - Add pref for PerformanceNavigationTiming r=baku

MozReview-Commit-ID: 9f6fcCk8mh

--HG--
extra : rebase_source : 0a1252a7cff2cfaec8f0ab5f8ffa755a0a8a4b5e

dom/base/nsContentUtils.cpp

@@ -290,6 +290,7 @@ bool nsContentUtils::sIsCutCopyAllowed = true;
 bool nsContentUtils::sIsFrameTimingPrefEnabled = false;
 bool nsContentUtils::sIsPerformanceTimingEnabled = false;
 bool nsContentUtils::sIsResourceTimingEnabled = false;
+bool nsContentUtils::sIsPerformanceNavigationTimingEnabled = false;
 bool nsContentUtils::sIsUserTimingLoggingEnabled = false;
 bool nsContentUtils::sIsFormAutofillAutocompleteEnabled = false;
 bool nsContentUtils::sIsWebComponentsEnabled = false;
@@ -691,6 +692,9 @@ nsContentUtils::Init()
   Preferences::AddBoolVarCache(&sIsResourceTimingEnabled,
                                "dom.enable_resource_timing", true);
 
+  Preferences::AddBoolVarCache(&sIsPerformanceNavigationTimingEnabled,
+                               "dom.enable_performance_navigation_timing", true);
+
   Preferences::AddBoolVarCache(&sIsUserTimingLoggingEnabled,
                                "dom.performance.enable_user_timing_logging", false);
 

dom/base/nsContentUtils.h

@@ -2273,6 +2273,14 @@ public:
     return sIsResourceTimingEnabled;
   }
 
+  /*
+   * Returns true if the performance timing APIs are enabled.
+   */
+  static bool IsPerformanceNavigationTimingEnabled()
+  {
+    return sIsPerformanceNavigationTimingEnabled;
+  }
+
   /*
    * Returns true if notification should be sent for peformance timing events.
    */
@@ -3340,6 +3348,7 @@ private:
   static uint32_t sHandlingInputTimeout;
   static bool sIsPerformanceTimingEnabled;
   static bool sIsResourceTimingEnabled;
+  static bool sIsPerformanceNavigationTimingEnabled;
   static bool sIsUserTimingLoggingEnabled;
   static bool sIsFrameTimingPrefEnabled;
   static bool sIsFormAutofillAutocompleteEnabled;

dom/performance/PerformanceMainThread.cpp

@@ -312,7 +312,7 @@ PerformanceMainThread::CreationTime() const
 void
 PerformanceMainThread::EnsureDocEntry()
 {
-  if (!mDocEntry) {
+  if (!mDocEntry && nsContentUtils::IsPerformanceNavigationTimingEnabled()) {
     nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(mChannel);
     mDocEntry = new PerformanceNavigationTiming(Timing(), this,
                                                 httpChannel);

modules/libpref/init/all.js

@@ -163,6 +163,9 @@ pref("dom.enable_performance", true);
 // Whether resource timing will be gathered and returned by performance.GetEntries*
 pref("dom.enable_resource_timing", true);
 
+// Whether performance.GetEntries* will contain an entry for the active document
+pref("dom.enable_performance_navigation_timing", true);
+
 // Enable printing performance marks/measures to log
 pref("dom.performance.enable_user_timing_logging", false);