Bug 1616570 - Part 2: Add the CookieJarSettingsArgs as a field in the window context. r=Ehsan,farre

This patch adds a new field CookieJarSettings in the window context.
This makes the CookieJarSettings can be accssible across the process
boundaries, which is needed for the work of making the ETP
Fission-compatible. We reuse the CookieJarSettingsArgs from the
NeckoChannelParams.ipdlh as the field here since it represents the
CookieJarSettings in IPDL and the syncedContext is based on the IPC
between processes. So, I think we can use it directly as a field.

Differential Revision: https://phabricator.services.mozilla.com/D63937

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

docshell/base/WindowContext.h

@@ -9,11 +9,14 @@
 
 #include "mozilla/dom/MaybeDiscarded.h"
 #include "mozilla/dom/SyncedContext.h"
+#include "mozilla/net/NeckoChannelParams.h"
 
 namespace mozilla {
 namespace dom {
 
-#define MOZ_EACH_WC_FIELD(FIELD) FIELD(OuterWindowId, uint64_t)
+#define MOZ_EACH_WC_FIELD(FIELD) \
+  FIELD(OuterWindowId, uint64_t) \
+  FIELD(CookieJarSettings, Maybe<mozilla::net::CookieJarSettingsArgs>)
 
 class WindowContext : public nsISupports, public nsWrapperCache {
   MOZ_DECL_SYNCED_CONTEXT(WindowContext, MOZ_EACH_WC_FIELD)
@@ -74,6 +77,12 @@ class WindowContext : public nsISupports, public nsWrapperCache {
     return GetOuterWindowId() == 0 && aValue != 0;
   }
 
+  bool CanSet(FieldIndex<IDX_CookieJarSettings>,
+              const Maybe<mozilla::net::CookieJarSettingsArgs>& aValue,
+              ContentParent* aSource) {
+    return true;
+  }
+
   // Overload `DidSet` to get notifications for a particular field being set.
   template <size_t I>
   void DidSet(FieldIndex<I>) {}