视频录制页面增加了计时器

@@ -701,6 +701,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.5"
+  pausable_timer:
+    dependency: "direct main"
+    description:
+      name: pausable_timer
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0+3"
   pedantic:
     dependency: transitive
     description:

@@ -99,6 +99,9 @@ dependencies:
   camera: ^0.9.4+5
   path_provider: ^2.0.8
 
+  # A Dart timer that can be paused, resumed and reset.
+  pausable_timer: ^1.0.0+3
+
 dependency_overrides:
   decimal: 1.5.0