[inspector] Build inspector under v8_enable_inspector build flag.

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_