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diff --git a/webkit/glue/debugger_bridge.h b/webkit/glue/debugger_bridge.h
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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// An interface to the V8 debugger.  This is in WebKit in order to isolate
+// the renderer from a direct V8 dependency.
+
+#ifndef WEBKIT_GLUE_DEBUGGER_BRIDGE_H_
+#define WEBKIT_GLUE_DEBUGGER_BRIDGE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/message_loop.h"
+#include "base/ref_counted.h"
+#include "v8/include/v8-debug.h"
+
+void V8DebugMessageHandler(const uint16_t* message, int length, void* data);
+
+class DebuggerBridge : public base::RefCountedThreadSafe<DebuggerBridge> {
+ public:
+  class Delegate {
+   public:
+    virtual void DebuggerOutput(const std::wstring& data) = 0;
+  };
+  // When constructed, the underlying V8 debugger is initialized and connected
+  // to the internals of this object.  The provided delegate received output
+  // from the debugger.  This output may be spontaneous (error messages,
+  // exceptions, etc.) or the output from a command.
+  // NOTE: the delegate will be called from another thread
+  DebuggerBridge(Delegate* del);
+  virtual ~DebuggerBridge();
+
+  // Break V8 execution.
+  void Break(bool force);
+
+  // Sends a command to the debugger (same as v8 command-line debugger).
+  // Results from the command come asynchronously.
+  // TODO(erikkay): link command output to a particular command
+  void Command(const std::wstring& cmd);
+
+  // Attach and detach from the V8 debug message handler.
+  void Attach();
+  void Detach();
+
+ private:
+  friend void V8DebugMessageHandler(const uint16_t* message,
+                                    int length, void* data);
+
+  // Called by the LocalDebugSession so that the delegate can called in the
+  // appropriate thread.
+  void OutputLater(const std::wstring& cmd);
+  // Calls the delegate.  This method is called in the delegate's thread.
+  void Output(const std::wstring& out);
+
+  Delegate* delegate_;
+  MessageLoop* delegate_loop_;
+  bool attached_;
+
+  DISALLOW_COPY_AND_ASSIGN(DebuggerBridge);
+};
+
+#endif  // WEBKIT_GLUE_DEBUGGER_BRIDGE_H_