Add CrossThreadCopier and isolatedCopy() to SourceLocation.

third_party/WebKit/Source/bindings/core/v8/SourceLocation.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 SourceLocation_h
 #define SourceLocation_h
 
 #include "core/CoreExport.h"
+#include "platform/CrossThreadCopier.h"
 #include "platform/v8_inspector/public/V8StackTrace.h"
 #include "wtf/Forward.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExecutionContext;
 class TracedValue;
 class V8StackTrace;
@@ skipping 12 matching lines @@
     ~SourceLocation();
 
     bool isEmpty() const { return m_url.isNull(); }
     const String& url() const { return m_url; }
     unsigned lineNumber() const { return m_lineNumber; }
     unsigned columnNumber() const { return m_columnNumber; }
     std::unique_ptr<V8StackTrace> takeStackTrace() { return std::move(m_stackTrace); }
     int scriptId() const { return m_scriptId; }
     void toTracedValue(TracedValue*, const char* name) const;
     PassOwnPtr<SourceLocation> clone() const;
+    PassOwnPtr<SourceLocation> isolatedCopy() const; // Safe to pass between threads.
 
 private:
     SourceLocation(const String& url, unsigned lineNumber, unsigned columnNumber, std::unique_ptr<V8StackTrace>, int scriptId);
     static PassOwnPtr<SourceLocation> createFromNonEmptyV8StackTrace(std::unique_ptr<V8StackTrace>, int scriptId);
 
     String m_url;
     unsigned m_lineNumber;
     unsigned m_columnNumber;
     std::unique_ptr<V8StackTrace> m_stackTrace;
     int m_scriptId;
 };
 
+template <>
+struct CrossThreadCopier<PassOwnPtr<SourceLocation>> {
+    using Type = PassOwnPtr<SourceLocation>;
+    static Type copy(PassOwnPtr<SourceLocation> location)
+    {
+        return location ? location->isolatedCopy() : nullptr;
+    }
+};
+
 } // namespace blink
 
 #endif // SourceLocation_h