Bug 1939881: Implement RFPTargetBits and replace appropriate uses. r=tjr

This is a huge patch, but it is only really refactoring of RFPTarget enum. We used to use RFPTarget as a bitset and now we ran out of bits, so now we need a workaround.

Differential Revision: https://phabricator.services.mozilla.com/D233182

dom/base/ChromeUtils.cpp

@@ -60,6 +60,7 @@
 #include "mozilla/RemoteDecoderManagerChild.h"
 #include "mozilla/KeySystemConfig.h"
 #include "mozilla/WheelHandlingHelper.h"
+#include "nsIRFPTargetSetIDL.h"
 #include "nsContentSecurityUtils.h"
 #include "nsString.h"
 #include "nsNativeTheme.h"
@@ -2444,7 +2445,7 @@ void ChromeUtils::GetAllPossibleUtilityActorNames(GlobalObject& aGlobal,
 /* static */
 bool ChromeUtils::ShouldResistFingerprinting(
     GlobalObject& aGlobal, JSRFPTarget aTarget,
-    const Nullable<uint64_t>& aOverriddenFingerprintingSettings,
+    nsIRFPTargetSetIDL* aOverriddenFingerprintingSettings,
     const Optional<bool>& aIsPBM) {
   RFPTarget target;
   switch (aTarget) {
@@ -2478,10 +2479,16 @@ bool ChromeUtils::ShouldResistFingerprinting(
     }
   }
 
-  Maybe<RFPTarget> overriddenFingerprintingSettings;
-  if (!aOverriddenFingerprintingSettings.IsNull()) {
-    overriddenFingerprintingSettings.emplace(
-        RFPTarget(aOverriddenFingerprintingSettings.Value()));
+  Maybe<RFPTargetSet> overriddenFingerprintingSettings;
+  if (aOverriddenFingerprintingSettings) {
+    uint64_t low, hi;
+    aOverriddenFingerprintingSettings->GetLow(&low);
+    aOverriddenFingerprintingSettings->GetHigh(&hi);
+    std::bitset<128> bitset;
+    bitset |= hi;
+    bitset <<= 64;
+    bitset |= low;
+    overriddenFingerprintingSettings.emplace(RFPTargetSet(bitset));
   }
 
   // This global object appears to be the global window, not for individual