Implemented File create API.

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index 6d69c975979e81f9389216c0ee2b92908f0b51fb..2289c0d0364bb4e76e27b6d8a473559a5dc80a53 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -45,7 +45,7 @@ void FUNCTION_NAME(File_Open)(Dart_NativeArguments args) {
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
   bool writable = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 1));
-  File* file = File::OpenFile(filename, writable);
+  File* file = File::Open(filename, writable);
   Dart_SetReturnValue(args, Dart_NewInteger(reinterpret_cast<intptr_t>(file)));
   Dart_ExitScope();
 }
@@ -55,7 +55,7 @@ void FUNCTION_NAME(File_Exists)(Dart_NativeArguments args) {
   Dart_EnterScope();
   const char* filename =
       DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
-  bool exists = File::FileExists(filename);
+  bool exists = File::Exists(filename);
   Dart_SetReturnValue(args, Dart_NewBoolean(exists));
   Dart_ExitScope();
 }
@@ -242,3 +242,13 @@ void FUNCTION_NAME(File_Flush)(Dart_NativeArguments args) {
   Dart_SetReturnValue(args, Dart_NewInteger(return_value));
   Dart_ExitScope();
 }
+
+
+void FUNCTION_NAME(File_Create)(Dart_NativeArguments args) {
+  Dart_EnterScope();
+  const char* str =
+      DartUtils::GetStringValue(Dart_GetNativeArgument(args, 0));
+  bool result = File::Create(str);
+  Dart_SetReturnValue(args, Dart_NewBoolean(result));
+  Dart_ExitScope();
+}