[sensors] Fix flakiness in generic sensors tests

third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js

Index: third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js
diff --git a/third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js b/third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js
index 60c6775c03fd78b14f7e6301041ce5e33bd98c09..c8d92ff2577dafc21662bb3691d2ce6285aa60cf 100644
--- a/third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js
+++ b/third_party/WebKit/LayoutTests/sensor/resources/sensor-helpers.js
@@ -276,6 +276,12 @@ function sensor_mocks(mojo) {
 
       // Mock functions
 
+      // Resets mock sensor provider stub bindings.
+      resetSensorProvider() {
+        this.reset();
+        bindings.StubBindings(this.stub_).close();
+      }
+
       // Resets state of mock SensorProvider between test runs.
       reset() {
         if (this.active_sensor_ != null) {
@@ -347,3 +353,10 @@ function sensor_test(func, name, properties) {
     return Promise.resolve(func(sensor)).then(onSuccess, onFailure);
   }), name, properties);
 }
+
+function resetSensorProvider() {
+  sensor_test(sensor => {
+    sensor.mockSensorProvider.resetSensorProvider();
+    return Promise.resolve();
+  }, 'Reset sensor provider proxy.');
+}