diff -r 000000000000 -r 6474c204b198 chrome/src/nsChromeProtocolHandler.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/chrome/src/nsChromeProtocolHandler.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim:set ts=4 sw=4 sts=4 et cin: */
+/* 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/. */
+
+/*
+
+  A protocol handler for ``chrome:''
+
+*/
+
+#include "nsChromeProtocolHandler.h"
+#include "nsChromeRegistry.h"
+#include "nsCOMPtr.h"
+#include "nsThreadUtils.h"
+#include "nsIChannel.h"
+#include "nsIChromeRegistry.h"
+#include "nsIFile.h"
+#include "nsIFileChannel.h"
+#include "nsIIOService.h"
+#include "nsILoadGroup.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsIStandardURL.h"
+#include "nsNetUtil.h"
+#include "nsString.h"
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMPL_ISUPPORTS(nsChromeProtocolHandler,
+                  nsIProtocolHandler,
+                  nsISupportsWeakReference)
+
+////////////////////////////////////////////////////////////////////////////////
+// nsIProtocolHandler methods:
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::GetScheme(nsACString &result)
+{
+    result.AssignLiteral("chrome");
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::GetDefaultPort(int32_t *result)
+{
+    *result = -1;        // no port for chrome: URLs
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::AllowPort(int32_t port, const char *scheme, bool *_retval)
+{
+    // don't override anything.
+    *_retval = false;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::GetProtocolFlags(uint32_t *result)
+{
+    *result = URI_STD | URI_IS_UI_RESOURCE | URI_IS_LOCAL_RESOURCE;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::NewURI(const nsACString &aSpec,
+                                const char *aCharset,
+                                nsIURI *aBaseURI,
+                                nsIURI **result)
+{
+    nsresult rv;
+
+    // Chrome: URLs (currently) have no additional structure beyond that provided
+    // by standard URLs, so there is no "outer" given to CreateInstance
+
+    nsCOMPtr<nsIStandardURL> surl(do_CreateInstance(NS_STANDARDURL_CONTRACTID, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = surl->Init(nsIStandardURL::URLTYPE_STANDARD, -1, aSpec, aCharset, aBaseURI);
+    if (NS_FAILED(rv))
+        return rv;
+
+    nsCOMPtr<nsIURL> url(do_QueryInterface(surl, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Canonify the "chrome:" URL; e.g., so that we collapse
+    // "chrome://navigator/content/" and "chrome://navigator/content"
+    // and "chrome://navigator/content/navigator.xul".
+
+    rv = nsChromeRegistry::Canonify(url);
+    if (NS_FAILED(rv))
+        return rv;
+
+    surl->SetMutable(false);
+
+    NS_ADDREF(*result = url);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsChromeProtocolHandler::NewChannel(nsIURI* aURI,
+                                    nsIChannel* *aResult)
+{
+    nsresult rv;
+
+    NS_ENSURE_ARG_POINTER(aURI);
+    NS_PRECONDITION(aResult, "Null out param");
+
+#ifdef DEBUG
+    // Check that the uri we got is already canonified
+    nsresult debug_rv;
+    nsCOMPtr<nsIURI> debugClone;
+    debug_rv = aURI->Clone(getter_AddRefs(debugClone));
+    if (NS_SUCCEEDED(debug_rv)) {
+        nsCOMPtr<nsIURL> debugURL (do_QueryInterface(debugClone));
+        debug_rv = nsChromeRegistry::Canonify(debugURL);
+        if (NS_SUCCEEDED(debug_rv)) {
+            bool same;
+            debug_rv = aURI->Equals(debugURL, &same);
+            if (NS_SUCCEEDED(debug_rv)) {
+                NS_ASSERTION(same, "Non-canonified chrome uri passed to nsChromeProtocolHandler::NewChannel!");
+            }
+        }
+    }
+#endif
+
+    nsCOMPtr<nsIChannel> result;
+
+    if (!nsChromeRegistry::gChromeRegistry) {
+        // We don't actually want this ref, we just want the service to
+        // initialize if it hasn't already.
+        nsCOMPtr<nsIChromeRegistry> reg =
+            mozilla::services::GetChromeRegistryService();
+        NS_ENSURE_TRUE(nsChromeRegistry::gChromeRegistry, NS_ERROR_FAILURE);
+    }
+
+    nsCOMPtr<nsIURI> resolvedURI;
+    rv = nsChromeRegistry::gChromeRegistry->ConvertChromeURL(aURI, getter_AddRefs(resolvedURI));
+    if (NS_FAILED(rv)) {
+#ifdef DEBUG
+        nsAutoCString spec;
+        aURI->GetSpec(spec);
+        printf("Couldn't convert chrome URL: %s\n", spec.get());
+#endif
+        return rv;
+    }
+
+    nsCOMPtr<nsIIOService> ioServ(do_GetIOService(&rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = ioServ->NewChannelFromURI(resolvedURI, getter_AddRefs(result));
+    if (NS_FAILED(rv)) return rv;
+
+#ifdef DEBUG
+    nsCOMPtr<nsIFileChannel> fileChan(do_QueryInterface(result));
+    if (fileChan) {
+        nsCOMPtr<nsIFile> file;
+        fileChan->GetFile(getter_AddRefs(file));
+
+        bool exists = false;
+        file->Exists(&exists);
+        if (!exists) {
+            nsAutoCString path;
+            file->GetNativePath(path);
+            printf("Chrome file doesn't exist: %s\n", path.get());
+        }
+    }
+#endif
+
+    // Make sure that the channel remembers where it was
+    // originally loaded from.
+    nsLoadFlags loadFlags = 0;
+    result->GetLoadFlags(&loadFlags);
+    result->SetLoadFlags(loadFlags & ~nsIChannel::LOAD_REPLACE);
+    rv = result->SetOriginalURI(aURI);
+    if (NS_FAILED(rv)) return rv;
+
+    // Get a system principal for content files and set the owner
+    // property of the result
+    nsCOMPtr<nsIURL> url = do_QueryInterface(aURI);
+    nsAutoCString path;
+    rv = url->GetPath(path);
+    if (StringBeginsWith(path, NS_LITERAL_CSTRING("/content/")))
+    {
+        nsCOMPtr<nsIScriptSecurityManager> securityManager =
+                 do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
+        if (NS_FAILED(rv)) return rv;
+
+        nsCOMPtr<nsIPrincipal> principal;
+        rv = securityManager->GetSystemPrincipal(getter_AddRefs(principal));
+        if (NS_FAILED(rv)) return rv;
+
+        nsCOMPtr<nsISupports> owner = do_QueryInterface(principal);
+        result->SetOwner(owner);
+    }
+
+    // XXX Removed dependency-tracking code from here, because we're not
+    // tracking them anyways (with fastload we checked only in DEBUG
+    // and with startupcache not at all), but this is where we would start
+    // if we need to re-add.
+    // See bug 531886, bug 533038.
+    result->SetContentCharset(NS_LITERAL_CSTRING("UTF-8"));
+
+    *aResult = result;
+    NS_ADDREF(*aResult);
+    return NS_OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////