import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

embedding/components/webbrowserpersist/WebBrowserPersistResourcesChild.cpp

@@ -0,0 +1,73 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebBrowserPersistResourcesChild.h"
+
+#include "WebBrowserPersistDocumentChild.h"
+#include "mozilla/dom/ContentChild.h"
+
+namespace mozilla {
+
+NS_IMPL_ISUPPORTS(WebBrowserPersistResourcesChild,
+                  nsIWebBrowserPersistResourceVisitor)
+
+WebBrowserPersistResourcesChild::WebBrowserPersistResourcesChild()
+{
+}
+
+WebBrowserPersistResourcesChild::~WebBrowserPersistResourcesChild()
+{
+}
+
+NS_IMETHODIMP
+WebBrowserPersistResourcesChild::VisitResource(nsIWebBrowserPersistDocument *aDocument,
+                                               const nsACString& aURI)
+{
+    nsCString copiedURI(aURI); // Yay, XPIDL/IPDL mismatch.
+    SendVisitResource(copiedURI);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+WebBrowserPersistResourcesChild::VisitDocument(nsIWebBrowserPersistDocument* aDocument,
+                                               nsIWebBrowserPersistDocument* aSubDocument)
+{
+    auto* subActor = new WebBrowserPersistDocumentChild();
+    // As a consequence of how PWebBrowserPersistDocumentConstructor
+    // can be sent by both the parent and the child, we must pass the
+    // aBrowser and outerWindowID arguments here, but the values are
+    // ignored by the parent.  In particular, the TabChild in which
+    // persistence started does not necessarily exist at this point;
+    // see bug 1203602.
+    if (!Manager()->Manager()
+        ->SendPWebBrowserPersistDocumentConstructor(subActor, nullptr, 0)) {
+        // NOTE: subActor is freed at this point.
+        return NS_ERROR_FAILURE;
+    }
+    // ...but here, IPC won't free subActor until after this returns
+    // to the event loop.
+
+    // The order of these two messages will be preserved, because
+    // they're the same toplevel protocol and priority.
+    //
+    // With this ordering, it's always the transition out of START
+    // state that causes a document's parent actor to be exposed to
+    // XPCOM (for both parent->child and child->parent construction),
+    // which simplifies the lifetime management.
+    SendVisitDocument(subActor);
+    subActor->Start(aSubDocument);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+WebBrowserPersistResourcesChild::EndVisit(nsIWebBrowserPersistDocument *aDocument,
+                                          nsresult aStatus)
+{
+    Send__delete__(this, aStatus);
+    return NS_OK;
+}
+
+} // namespace mozilla