Bug 1341898 - Make nsDocument::IsWebComponentsEnabled use a cached bool pref;

Note: Minus IPC bit.

Tag UXP Issue #1344

dom/base/CustomElementRegistry.cpp

@@ -172,7 +172,7 @@ NS_INTERFACE_MAP_END
 CustomElementRegistry::IsCustomElementEnabled(JSContext* aCx, JSObject* aObject)
 {
   return Preferences::GetBool("dom.webcomponents.customelements.enabled") ||
-         Preferences::GetBool("dom.webcomponents.enabled");
+         nsContentUtils::IsWebComponentsEnabled();
 }
 
 /* static */ void

dom/base/nsContentUtils.cpp

@@ -284,6 +284,7 @@ bool nsContentUtils::sIsResourceTimingEnabled = false;
 bool nsContentUtils::sIsPerformanceNavigationTimingEnabled = false;
 bool nsContentUtils::sIsUserTimingLoggingEnabled = false;
 bool nsContentUtils::sIsExperimentalAutocompleteEnabled = false;
+bool nsContentUtils::sIsWebComponentsEnabled = false;
 bool nsContentUtils::sEncodeDecodeURLHash = false;
 bool nsContentUtils::sGettersDecodeURLHash = false;
 bool nsContentUtils::sPrivacyResistFingerprinting = false;
@@ -584,6 +585,9 @@ nsContentUtils::Init()
   Preferences::AddBoolVarCache(&sIsExperimentalAutocompleteEnabled,
                                "dom.forms.autocomplete.experimental", false);
 
+  Preferences::AddBoolVarCache(&sIsWebComponentsEnabled,
+                               "dom.webcomponents.enabled", false);
+
   Preferences::AddBoolVarCache(&sEncodeDecodeURLHash,
                                "dom.url.encode_decode_hash", false);
 
@@ -9834,4 +9838,4 @@ nsContentUtils::IsLocalRefURL(const nsString& aString)
   }
 
   return false;
-}
+}

dom/base/nsContentUtils.h

@@ -2743,6 +2743,9 @@ public:
   static bool
   IsLocalRefURL(const nsString& aString);
 
+  static bool
+  IsWebComponentsEnabled() { return sIsWebComponentsEnabled; }
+
 private:
   static bool InitializeEventTable();
 
@@ -2850,6 +2853,7 @@ private:
   static bool sIsUserTimingLoggingEnabled;
   static bool sIsFrameTimingPrefEnabled;
   static bool sIsExperimentalAutocompleteEnabled;
+  static bool sIsWebComponentsEnabled;
   static bool sEncodeDecodeURLHash;
   static bool sGettersDecodeURLHash;
   static bool sPrivacyResistFingerprinting;

dom/base/nsDocument.cpp

@@ -5710,7 +5710,7 @@ nsDocument::IsWebComponentsEnabled(JSContext* aCx, JSObject* aObject)
 {
   JS::Rooted<JSObject*> obj(aCx, aObject);
 
-  if (Preferences::GetBool("dom.webcomponents.enabled")) {
+  if (nsContentUtils::IsWebComponentsEnabled()) {
     return true;
   }
 
@@ -5726,7 +5726,7 @@ nsDocument::IsWebComponentsEnabled(JSContext* aCx, JSObject* aObject)
 bool
 nsDocument::IsWebComponentsEnabled(dom::NodeInfo* aNodeInfo)
 {
-  if (Preferences::GetBool("dom.webcomponents.enabled")) {
+  if (nsContentUtils::IsWebComponentsEnabled()) {
     return true;
   }