Add ReadableStream operations to use it from Fetch API

third_party/WebKit/Source/core/streams/ReadableStreamOperations.h

 // Copyright 2015 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 ReadableStreamOperations_h
 #define ReadableStreamOperations_h
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include <v8.h>
@@ skipping 25 matching lines @@
     // errored.
     static ScriptValue getReader(ScriptState*, ScriptValue stream, ExceptionState&);
 
     // IsReadableStream
     static bool isReadableStream(ScriptState*, ScriptValue);
 
     // IsReadableStreamDisturbed
     // This function assumes |isReadableStream(stream)|.
     static bool isDisturbed(ScriptState*, ScriptValue stream);
 
+    // SetReadableStreamDisturbed
+    // This function assumes |isReadableStream(stream)|.
+    static void setDisturbed(ScriptState*, ScriptValue stream);
+
     // IsReadableStreamLocked
     // This function assumes |isReadableStream(stream)|.
     static bool isLocked(ScriptState*, ScriptValue stream);
 
+    // IsReadableStreamReadable
+    // This function assumes |isReadableStream(stream)|.
+    static bool isReadable(ScriptState*, ScriptValue stream);
+
+    // IsReadableStreamClosed
+    // This function assumes |isReadableStream(stream)|.
+    static bool isClosed(ScriptState*, ScriptValue stream);
+
+    // IsReadableStreamErrored
+    // This function assumes |isReadableStream(stream)|.
+    static bool isErrored(ScriptState*, ScriptValue stream);
+
     // IsReadableStreamReader
     static bool isReadableStreamReader(ScriptState*, ScriptValue);
 
     // ReadFromReadableStreamReader
     // This function assumes |isReadableStreamReader(reader)|.
     static ScriptPromise read(ScriptState*, ScriptValue reader);
 };
 
 } // namespace blink
 
 #endif // ReadableStreamOperations_h