Implement WebVR presentation pausing for VR Shell Menu Mode

device/vr/vr_service_impl_unittest.cc

 // 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.
 
 #include "device/vr/vr_service_impl.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "device/vr/test/fake_vr_device.h"
 #include "device/vr/test/fake_vr_device_provider.h"
@@ skipping 15 matching lines @@
   }
 
   MOCK_METHOD1(OnExitPresent, void(uint32_t index));
 
   MOCK_METHOD1(OnDisplayConnected, void(const VRDisplay& display));
   void OnDisplayConnected(VRDisplayPtr display) override {
     OnDisplayConnected(*display);
     last_display_ = std::move(display);
   }
   void OnDisplayDisconnected(unsigned index) override {}
+  void OnDisplayBlur(unsigned index) override {}
+  void OnDisplayFocus(unsigned index) override {}
 
   const VRDisplayPtr& LastDisplay() { return last_display_; }
 
  private:
   VRDisplayPtr last_display_;
 };
 
 class VRServiceTestBinding {
  public:
   VRServiceTestBinding() {
@@ skipping 152 matching lines @@
 
   std::unique_ptr<FakeVRDevice> device(new FakeVRDevice(provider_));
   device_manager_->OnDeviceConnectionStatusChanged(device.get(), true);
 
   base::RunLoop().RunUntilIdle();
 
   EXPECT_EQ(device->id(), service_1->client().LastDisplay()->index);
   EXPECT_EQ(device->id(), service_2->client().LastDisplay()->index);
 }
 }