[DevTools] Reduce API surface of String16.

third_party/WebKit/Source/platform/inspector_protocol/String16.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 String16_h
 #define String16_h
 
 #if V8_INSPECTOR_USE_STL
 #include "platform/inspector_protocol/String16STL.h"
 #else
 #include "platform/inspector_protocol/String16WTF.h"
 #endif // V8_INSPECTOR_USE_STL
 
+#include "platform/inspector_protocol/Platform.h"
+
+#include <vector>
+
+namespace blink {
+namespace protocol {
+
+PLATFORM_EXPORT bool isASCIISpace(UChar);

[pfeldman, 2016/08/09 17:20:38]

Looks like String16Base others inherit from to me.

+PLATFORM_EXPORT bool isSpaceOrNewLine(UChar);
+PLATFORM_EXPORT String16 string16FromInteger(int);
+PLATFORM_EXPORT String16 string16FromDouble(double);
+PLATFORM_EXPORT String16 string16FromDoublePrecision3(double);
+PLATFORM_EXPORT String16 string16FromDoublePrecision6(double);
+PLATFORM_EXPORT double string16CharactersToDouble(const UChar*, size_t, bool* ok = nullptr);
+PLATFORM_EXPORT int string16CharactersToInt(const UChar*, size_t, bool* ok = nullptr);
+PLATFORM_EXPORT String16 string16StripWhiteSpace(const String16&);
+PLATFORM_EXPORT bool string16StartsWith(const String16&, const char* prefix);
+
+class String16Builder {
+public:
+    String16Builder();
+    void append(const String16&);
+    void append(UChar);
+    void append(char);
+    void append(const UChar*, size_t);
+    void append(const char*, size_t);
+    String16 toString();
+    void reserveCapacity(size_t);
+
+private:
+    std::vector<UChar> m_buffer;
+};
+
+} // namespace protocol
+} // namespace blink
+
+using String16 = blink::protocol::String16;
+using String16Builder = blink::protocol::String16Builder;
+
 #endif // !defined(String16_h)