Implemented File create API.

runtime/bin/file.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_FILE_H_
 #define BIN_FILE_H_
 
 #if defined(_WIN32)
 typedef signed __int64 int64_t;
 typedef unsigned __int8 uint8_t;
@@ skipping 34 matching lines @@
 
   // Get the current position in the file.
   // Returns a negative value if position cannot be determined.
   off_t Position();
 
   // Flush contents of file.
   void Flush();
 
   const char* name() const { return name_; }
 
-  static File* OpenFile(const char* name, bool writable);
-  static bool FileExists(const char* name);
+  static File* Open(const char* name, bool writable);
+  static bool Exists(const char* name);
+  static bool Create(const char* name);
   static bool IsAbsolutePath(const char* pathname);
   static char* GetCanonicalPath(const char* name);
   static const char* PathSeparator();
   static const char* StringEscapedPathSeparator();
 
  private:
   File(const char* name, FileHandle* handle) : name_(name), handle_(handle) { }
   void Close();
   bool IsClosed();
 
   static const int kClosedFd = -1;
 
   const char* name_;
   // FileHandle is an OS specific class which stores data about the file.
   FileHandle* handle_;  // OS specific handle for the file.
 
   // DISALLOW_COPY_AND_ASSIGN(File).
   File(const File&);
   void operator=(const File&);
 };
 
 #endif  // BIN_FILE_H_