[inspector] Initial import of v8_inspector.

src/inspector/Allocator.h

Index: src/inspector/Allocator.h
diff --git a/src/inspector/Allocator.h b/src/inspector/Allocator.h
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+++ b/src/inspector/Allocator.h
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+// Copyright 2016 the V8 project 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 V8_INSPECTOR_ALLOCATOR_H_
+#define V8_INSPECTOR_ALLOCATOR_H_
+
+#include <cstddef>
+#include <cstdint>
+
+enum NotNullTagEnum { NotNullLiteral };
+
+#define V8_INSPECTOR_DISALLOW_NEW()                           \
+ private:                                                     \
+  void* operator new(size_t) = delete;                        \
+  void* operator new(size_t, NotNullTagEnum, void*) = delete; \
+  void* operator new(size_t, void*) = delete;                 \
+                                                              \
+ public:
+
+#define V8_INSPECTOR_DISALLOW_COPY(ClassName) \
+ private:                                     \
+  ClassName(const ClassName&) = delete;       \
+  ClassName& operator=(const ClassName&) = delete
+
+// Macro that returns a compile time constant with the length of an array, but
+// gives an error if passed a non-array.
+template <typename T, std::size_t Size>
+char (&ArrayLengthHelperFunction(T (&)[Size]))[Size];
+// GCC needs some help to deduce a 0 length array.
+#if defined(__GNUC__)
+template <typename T>
+char (&ArrayLengthHelperFunction(T (&)[0]))[0];
+#endif
+#define V8_INSPECTOR_ARRAY_LENGTH(array) \
+  sizeof(::ArrayLengthHelperFunction(array))
+
+#endif  // V8_INSPECTOR_ALLOCATOR_H_