Bug 1352025 part 1 - Use a UrlExtraData type alias to unify url handling logic. r=manishearth

MozReview-Commit-ID: 6gZHGQWbpAW

--HG--
extra : rebase_source : 0780021a0e5ef14b380ec247418c1c709056e792

layout/style/ServoBindings.cpp

@@ -7,6 +7,7 @@
 #include "mozilla/ServoBindings.h"
 
 #include "ChildIterator.h"
+#include "NullPrincipalURI.h"
 #include "gfxFontFamilyList.h"
 #include "nsAnimationManager.h"
 #include "nsAttrValueInlines.h"
@@ -1577,6 +1578,15 @@ Gecko_LoadStyleSheet(css::Loader* aLoader,
   aLoader->LoadChildSheet(aParent, uri, media, nullptr, aChildSheet, nullptr);
 }
 
+RawGeckoURLExtraData*
+Gecko_URLExtraData_CreateDummy()
+{
+  RefPtr<css::URLExtraData> data =
+    new css::URLExtraData(NullPrincipalURI::Create(), nullptr,
+                          NullPrincipal::Create());
+  return data.forget().take();
+}
+
 const nsMediaFeature*
 Gecko_GetMediaFeatures()
 {

layout/style/ServoBindings.h

@@ -118,6 +118,10 @@ void Gecko_LoadStyleSheet(mozilla::css::Loader* loader,
                           const uint8_t* media_bytes,
                           uint32_t media_length);
 
+// URLExtraData
+// Create a new addrefed URLExtraData.
+RawGeckoURLExtraData* Gecko_URLExtraData_CreateDummy();
+
 // By default, Servo walks the DOM by traversing the siblings of the DOM-view
 // first child. This generally works, but misses anonymous children, which we
 // want to traverse during styling. To support these cases, we create an