Bug 1250377 - Part 2: Stub out enough ServoStyleSet methods to be able to create one for a document. r=bholley

layout/style/ServoStyleSet.cpp

@@ -11,28 +11,30 @@
 using namespace mozilla;
 using namespace mozilla::dom;
 
+ServoStyleSet::ServoStyleSet()
+  : mBatching(0)
+{
+}
+
 void
 ServoStyleSet::Init(nsPresContext* aPresContext)
 {
-  MOZ_CRASH("stylo: not implemented");
 }
 
 void
 ServoStyleSet::BeginShutdown()
 {
-  MOZ_CRASH("stylo: not implemented");
 }
 
 void
 ServoStyleSet::Shutdown()
 {
-  MOZ_CRASH("stylo: not implemented");
 }
 
 bool
 ServoStyleSet::GetAuthorStyleDisabled() const
 {
-  MOZ_CRASH("stylo: not implemented");
+  return false;
 }
 
 nsresult
@@ -44,13 +46,19 @@ ServoStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled)
 void
 ServoStyleSet::BeginUpdate()
 {
-  MOZ_CRASH("stylo: not implemented");
+  ++mBatching;
 }
 
 nsresult
 ServoStyleSet::EndUpdate()
 {
-  MOZ_CRASH("stylo: not implemented");
+  MOZ_ASSERT(mBatching > 0);
+  if (--mBatching > 0) {
+    return NS_OK;
+  }
+
+  // ... do something ...
+  return NS_OK;
 }
 
 // resolve a style context

layout/style/ServoStyleSet.h

@@ -22,6 +22,7 @@ class Element;
 class CSSStyleSheet;
 class ServoStyleSheet;
 } // namespace mozilla
+class nsIDocument;
 class nsStyleContext;
 class nsPresContext;
 struct TreeMatchContext;
@@ -35,6 +36,8 @@ namespace mozilla {
 class ServoStyleSet
 {
 public:
+  ServoStyleSet();
+
   void Init(nsPresContext* aPresContext);
   void BeginShutdown();
   void Shutdown();
@@ -105,6 +108,9 @@ public:
                                        mozilla::CSSPseudoElementType aPseudoType,
                                        dom::Element* aPseudoElement,
                                        EventStates aStateMask);
+
+private:
+  int32_t mBatching;
 };
 
 } // namespace mozilla