Introduce SourceLocation to be used for console messages.

third_party/WebKit/Source/platform/v8_inspector/V8StackTraceImpl.h

 // Copyright 2016 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.
 
 #ifndef V8StackTraceImpl_h
 #define V8StackTraceImpl_h
 
 #include "platform/inspector_protocol/Collections.h"
 #include "platform/v8_inspector/public/V8StackTrace.h"
 #include "wtf/PassOwnPtr.h"
@@ skipping 29 matching lines @@
         String16 m_functionName;
         String16 m_scriptId;
         String16 m_scriptName;
         int m_lineNumber;
         int m_columnNumber;
     };
 
     static PassOwnPtr<V8StackTraceImpl> create(V8DebuggerAgentImpl*, v8::Local<v8::StackTrace>, size_t maxStackSize, const String16& description = String16());
     static PassOwnPtr<V8StackTraceImpl> capture(V8DebuggerAgentImpl*, size_t maxStackSize, const String16& description = String16());
 
-    PassOwnPtr<V8StackTraceImpl> clone();
+    PassOwnPtr<V8StackTrace> clone() override;
+    PassOwnPtr<V8StackTraceImpl> cloneImpl();
     PassOwnPtr<protocol::Runtime::StackTrace> buildInspectorObjectForTail(V8DebuggerAgentImpl*) const;
     ~V8StackTraceImpl() override;
 
     // V8StackTrace implementation.
     bool isEmpty() const override { return !m_frames.size(); };
     String16 topSourceURL() const override;
     int topLineNumber() const override;
     int topColumnNumber() const override;
     String16 topScriptId() const override;
     String16 topFunctionName() const override;
     PassOwnPtr<protocol::Runtime::StackTrace> buildInspectorObject() const override;
     String16 toString() const override;
 
 private:
     V8StackTraceImpl(const String16& description, protocol::Vector<Frame>& frames, PassOwnPtr<V8StackTraceImpl> parent);
 
     String16 m_description;
     protocol::Vector<Frame> m_frames;
     OwnPtr<V8StackTraceImpl> m_parent;
 };
 
 } // namespace blink
 
 #endif // V8StackTraceImpl_h