Added begin/end load methods

content/base/public/nsIDocument.h

@@ -133,6 +133,8 @@ public:
 
   // Observation hooks used by content nodes to propagate
   // notifications to document observers.
+  NS_IMETHOD BeginLoad() = 0;
+  NS_IMETHOD EndLoad() = 0;
   virtual void ContentChanged(nsIContent* aContent,
                               nsISupports* aSubContent) = 0;
 

layout/base/public/nsIDocument.h

@@ -133,6 +133,8 @@ public:
 
   // Observation hooks used by content nodes to propagate
   // notifications to document observers.
+  NS_IMETHOD BeginLoad() = 0;
+  NS_IMETHOD EndLoad() = 0;
   virtual void ContentChanged(nsIContent* aContent,
                               nsISupports* aSubContent) = 0;