Add ReadableStream operations to use it from Fetch API

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

Index: third_party/WebKit/Source/core/streams/ReadableStreamOperations.h
diff --git a/third_party/WebKit/Source/core/streams/ReadableStreamOperations.h b/third_party/WebKit/Source/core/streams/ReadableStreamOperations.h
index 2a0d0647542942775e531021a59f6eb58eb28efa..bd885ba6d97a465a61fc8d799e6efbf560fd9ff2 100644
--- a/third_party/WebKit/Source/core/streams/ReadableStreamOperations.h
+++ b/third_party/WebKit/Source/core/streams/ReadableStreamOperations.h
@@ -43,10 +43,26 @@ public:
     // 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);