DevTools: defer styles delta calculation to until the end of the task.

Source/core/inspector/InspectorInstrumentation.idl

 /*
 * Copyright (C) 2013 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
 
     [DOM, Inline=FastReturn]
     void didRemoveDOMAttr([Keep] Element*, const AtomicString& name);
 
     [DOM, Inline=FastReturn]
     void characterDataModified([Keep] CharacterData*);
 
     [DOM, DOMDebugger, Inline=FastReturn]
     void didInvalidateStyleAttr([Keep] Node*);
 
+    [CSS]
+    void documentDisposed([Keep] Document*);
+
     [CSS, Inline=FastReturn]
     void willMutateRules(CSSStyleSheet*);
 
     [CSS, Inline=FastReturn]
     void didMutateRules([Keep] CSSStyleSheet*);
 
     [CSS, Inline=FastReturn]
     void willMutateStyle(CSSStyleDeclaration*);
 
     [CSS, Inline=FastReturn]
@@ skipping 430 matching lines @@
 
     [Debugger, Inline=FastReturn]
     void didCreatePromise(ExecutionContext*, const ScriptObject& promise);
 
     [Debugger, Inline=FastReturn]
     void didUpdatePromiseParent(ExecutionContext*, const ScriptObject& promise, const ScriptObject& parentPromise);
 
     [Debugger, Inline=FastReturn]
     void didUpdatePromiseState(ExecutionContext*, const ScriptObject& promise, V8PromiseCustom::PromiseState, const ScriptValue& result);
 }