[DevTools] Migrate v8_inspector/public from String16 to String{View,Buffer}.

third_party/WebKit/Source/platform/v8_inspector/public/StringView.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.
+
+// Note: this include guard is very specific to not clash with wtf. Will be changed after moving out of blink.
+#ifndef v8_inspector_public_StringView_h
+#define v8_inspector_public_StringView_h
+
+#include "platform/PlatformExport.h"
+
+#include <cctype>
+#include <stdint.h>
+
+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