[video_player] Improve macOS frame management

packages/video_player/video_player_avfoundation/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.5.2
+
+* Fixes flickering and seek-while-paused on macOS.
+
 ## 2.5.1
 
 * Updates to  Pigeon 13.

packages/video_player/video_player_avfoundation/darwin/Classes/FVPDisplayLink.h

@@ -0,0 +1,34 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+
+#if TARGET_OS_OSX
+#import <FlutterMacOS/FlutterMacOS.h>
+#else
+#import <Flutter/Flutter.h>
+#endif
+
+// A cross-platform display link abstraction.
+@interface FVPDisplayLink : NSObject
+
+/**
+ * Whether the display link is currently running (i.e., firing events).
+ *
+ * Defaults to NO.
+ */
+@property(nonatomic, assign) BOOL running;
+
+/**
+ * Initializes a display link that calls the given callback when fired.
+ *
+ * The display link starts paused, so must be started, by setting 'running' to YES, before the
+ * callback will fire.
+ */
+- (instancetype)initWithRegistrar:(id<FlutterPluginRegistrar>)registrar
+                         callback:(void (^)(void))callback NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+@end