Send reload / restart time to frame to analytics (#5335)

packages/flutter_tools/lib/src/hot.dart

@@ -473,6 +473,7 @@ class HotRunner extends ResidentRunner {
     printStatus('Restart time: '
                 '${getElapsedAsMilliseconds(firstFrameTimer.elapsed)}');
     flutterUsage.sendEvent('hot', 'restart');
+    flutterUsage.sendTiming('hot', 'restart', firstFrameTimer.elapsed);
   }
 
   /// Returns [true] if the reload was successful.
@@ -537,6 +538,7 @@ class HotRunner extends ResidentRunner {
     await firstFrameTimer.firstFrame();
     printStatus('Hot reload time: '
                 '${getElapsedAsMilliseconds(firstFrameTimer.elapsed)}');
+    flutterUsage.sendTiming('hot', 'reload', firstFrameTimer.elapsed);
     return true;
   }
 

packages/flutter_tools/lib/src/usage.dart

@@ -70,6 +70,10 @@ class Usage {
       _analytics.sendEvent(category, parameter);
   }
 
+  void sendTiming(String category, String variableName, Duration duration) {
+    _analytics.sendTiming(variableName, duration.inMilliseconds, category: category);
+  }
+
   UsageTimer startTimer(String event) {
     if (suppressAnalytics)
       return new _MockUsageTimer();

packages/flutter_tools/test/src/context.dart

@@ -138,6 +138,9 @@ class MockUsage implements Usage {
   @override
   void sendEvent(String category, String parameter) { }
 
+  @override
+  void sendTiming(String category, String variableName, Duration duration) { }
+
   @override
   UsageTimer startTimer(String event) => new _MockUsageTimer(event);