Expose Gamepad API instance for Cardboard button

chrome/browser/android/vr_shell/ui_scene_manager_unittest.cc

 // Copyright 2017 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 "chrome/browser/android/vr_shell/ui_scene_manager.h"
 
 #include "base/macros.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
 #include "chrome/browser/android/vr_shell/vr_browser_interface.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 18 matching lines @@
   MOCK_METHOD0(AppButtonClicked, void());
   MOCK_METHOD0(ForceExitVr, void());
   MOCK_METHOD0(ExitPresent, void());
   MOCK_METHOD0(ExitFullscreen, void());
   MOCK_METHOD2(
       RunVRDisplayInfoCallback,
       void(const base::Callback<void(device::mojom::VRDisplayInfoPtr)>&,
            device::mojom::VRDisplayInfoPtr*));
   MOCK_METHOD1(OnContentPaused, void(bool));
   MOCK_METHOD0(NavigateBack, void());
+  MOCK_METHOD1(ToggleCardboardGamepad, void(bool));
 
   // Stub this as scoped pointers don't work as mock method parameters.
   void ProcessContentGesture(std::unique_ptr<blink::WebInputEvent>) {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockBrowserInterface);
 };
 
 }  // namespace
 
@@ skipping 18 matching lines @@
 
 TEST_F(UiSceneManagerTest, ExitPresentAndFullscreenOnAppButtonClick) {
   // Clicking app button should trigger to exit presentation.
   EXPECT_CALL(*browser_, ExitPresent()).Times(1);
   // And also trigger exit fullscreen.
   EXPECT_CALL(*browser_, ExitFullscreen()).Times(1);
   manager_->OnAppButtonClicked();
 }
 
 }  // namespace vr_shell