fixed bugs in ios version

ios/Flutter/Flutter.framework/Headers/FlutterTexture.h

@@ -0,0 +1,29 @@
+// Copyright 2017 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 FLUTTER_FLUTTERTEXTURE_H_
+#define FLUTTER_FLUTTERTEXTURE_H_
+
+#import <CoreMedia/CoreMedia.h>
+#import <Foundation/Foundation.h>
+
+#include "FlutterMacros.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+FLUTTER_EXPORT
+@protocol FlutterTexture<NSObject>
+- (CVPixelBufferRef)copyPixelBuffer;
+@end
+
+FLUTTER_EXPORT
+@protocol FlutterTextureRegistry<NSObject>
+- (int64_t)registerTexture:(NSObject<FlutterTexture>*)texture;
+- (void)textureFrameAvailable:(int64_t)textureId;
+- (void)unregisterTexture:(int64_t)textureId;
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif  // FLUTTER_FLUTTERTEXTURE_H_