[sensors] Fix flakiness in generic sensors tests

third_party/WebKit/Source/modules/sensor/SensorProviderProxy.h

 // Copyright 2016 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 SensorProviderProxy_h
 #define SensorProviderProxy_h
 
 #include "core/frame/LocalFrame.h"
 #include "device/generic_sensor/public/interfaces/sensor.mojom-blink.h"
 #include "device/generic_sensor/public/interfaces/sensor_provider.mojom-blink.h"
@@ skipping 25 matching lines @@
 
   SensorProxy* getSensorProxy(device::mojom::blink::SensorType);
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   friend class SensorProxy;  // To call sensorProvider().
 
   explicit SensorProviderProxy(LocalFrame*);
   static const char* supplementName();
+  void initializeSensorProviderIfNeeded(LocalFrame*);
 
-  device::mojom::blink::SensorProvider* sensorProvider() const {
-    return m_sensorProvider.get();
-  }
+  device::mojom::blink::SensorProvider* getSensorProvider() const;
 
   void onSensorProviderConnectionError();
 
   using SensorsSet = HeapHashSet<WeakMember<SensorProxy>>;
   SensorsSet m_sensorProxies;
 
   device::mojom::blink::SensorProviderPtr m_sensorProvider;
 };
 
 }  // namespace blink
 
 #endif  // SensorProviderProxy_h