Add ScriptValue.v8ValueUnsafe() to access the V8 value without cross-context access check.

Source/core/inspector/InspectorDebuggerAgent.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1187 matching lines @@
     if (!m_asyncCallStackTracker.isEnabled())
         return nullptr;
     const AsyncCallStackTracker::AsyncCallChain* chain = m_asyncCallStackTracker.currentAsyncCallChain();
     if (!chain)
         return nullptr;
     const AsyncCallStackTracker::AsyncCallStackVector& callStacks = chain->callStacks();
     if (callStacks.isEmpty())
         return nullptr;
     RefPtrWillBeRawPtr<ScriptAsyncCallStack> result = nullptr;
     for (AsyncCallStackTracker::AsyncCallStackVector::const_reverse_iterator it = callStacks.rbegin(); it != callStacks.rend(); ++it) {
-        RefPtrWillBeRawPtr<JavaScriptCallFrame> callFrame = ScriptDebugServer::toJavaScriptCallFrame((*it)->callFrames());
+        RefPtrWillBeRawPtr<JavaScriptCallFrame> callFrame = ScriptDebugServer::toJavaScriptCallFrameUnsafe((*it)->callFrames());
         if (!callFrame)
             break;
         result = ScriptAsyncCallStack::create((*it)->description(), toScriptCallStack(callFrame.get()), result.release());
     }
     return result.release();
 }
 
 String InspectorDebuggerAgent::sourceMapURLForScript(const Script& script, CompileResult compileResult)
 {
     bool hasSyntaxError = compileResult != CompileSuccess;
@@ skipping 208 matching lines @@
 {
     m_scripts.clear();
     m_breakpointIdToDebugServerBreakpointIds.clear();
     m_asyncCallStackTracker.clear();
     if (m_frontend)
         m_frontend->globalObjectCleared();
 }
 
 } // namespace blink