[DevTools] Use inspector_protocol generator in content/browser/devtools.

content/browser/devtools/protocol_string.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 CONTENT_BROWSER_DEVTOOLS_PROTOCOL_STRING_H
+#define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_STRING_H
+
+#include <memory>
+#include <string>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/strings/string_number_conversions.h"
+#include "content/common/content_export.h"
+
+namespace content {
+namespace protocol {
+
+class Value;
+
+using String = std::string;
+
+class CONTENT_EXPORT StringBuilder {
+ public:
+  StringBuilder();
+  ~StringBuilder();
+  void append(const std::string&);
+  void append(char);
+  void append(const char*, size_t);
+  std::string toString();
+  void reserveCapacity(size_t);
+
+ private:
+  std::string string_;
+};
+
+class CONTENT_EXPORT StringUtil {
+ public:
+  static String substring(const String& s, unsigned pos, unsigned len) {
+    return s.substr(pos, len);
+  }
+  static String fromInteger(int number) {
+    return base::IntToString(number);
+  }
+  static String fromDouble(double number) {
+    return base::DoubleToString(number);
+  }
+  static const size_t kNotFound = static_cast<size_t>(-1);
+  static void builderReserve(StringBuilder& builder, unsigned capacity) {
+    builder.reserveCapacity(capacity);
+  }
+  static std::unique_ptr<protocol::Value> parseJSON(const String&);
+};
+
+}  // namespace protocol
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_STRING_H