[inspector] Initial import of v8_inspector.

src/inspector/public/StringView.h

+// 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_PUBLIC_STRINGVIEW_H_
+#define V8_INSPECTOR_PUBLIC_STRINGVIEW_H_
+
+#include <stdint.h>
+#include <cctype>
+
+namespace v8_inspector {
+
+class PLATFORM_EXPORT StringView {
+ public:
+  StringView() : m_is8Bit(true), m_length(0), m_characters8(nullptr) {}
+
+  StringView(const uint8_t* characters, unsigned length)
+      : m_is8Bit(true), m_length(length), m_characters8(characters) {}
+
+  StringView(const uint16_t* characters, unsigned length)
+      : m_is8Bit(false), m_length(length), m_characters16(characters) {}
+
+  bool is8Bit() const { return m_is8Bit; }
+  unsigned length() const { return m_length; }
+
+  // TODO(dgozman): add DCHECK(m_is8Bit) to accessors once platform can be used
+  // here.
+  const uint8_t* characters8() const { return m_characters8; }
+  const uint16_t* characters16() const { return m_characters16; }
+
+ private:
+  bool m_is8Bit;
+  unsigned m_length;
+  union {
+    const uint8_t* m_characters8;
+    const uint16_t* m_characters16;
+  };
+};
+
+}  // namespace v8_inspector
+
+#endif  // V8_INSPECTOR_PUBLIC_STRINGVIEW_H_