Expose Gamepad API instance for Cardboard button

device/vr/android/gvr/gvr_gamepad_data_provider.h

 // 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.
 
 #ifndef DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H
 #define DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H
 
 #include "device/vr/vr_types.h"
 
 namespace device {
 
 class GvrGamepadDataFetcher;
 
 // Subset of GVR controller data needed for the gamepad API. Filled in
 // by vr_shell's VrController and consumed by GvrGamepadDataFetcher.
 struct GvrGamepadData {
   int64_t timestamp;
-  gfx::Vector2dF touch_pos;
+  gfx::Vector2dF touch_pos;  // controller touch position

[billorr1, 2017/05/12 18:25:42]

nit: comments should be complete sentences

[billorr1, 2017/05/15 23:04:17]

Done.

   vr::Quatf orientation;
   gfx::Vector3dF accel;
   gfx::Vector3dF gyro;
-  bool is_touching;
+  bool is_controller_touching;
   bool controller_button_pressed;
   bool right_handed;
+  bool is_screen_touching;  // For cardboard, only the screen touch matters
 };
 
 // This class exposes GVR controller data to the gamepad API. Data is
 // polled by VrShellGl, then pushed from VrShell which implements the
 // GvrGamepadDataProvider interface.
 //
 // More specifically, here's the lifecycle, assuming VrShell
 // implements GvrGamepadDataProvider:
 //
 // - VrShell creates GvrGamepadDataFetcherFactory from
@@ skipping 23 matching lines @@
   virtual void UpdateGamepadData(GvrGamepadData data) = 0;
 
   // Called by the gamepad data fetcher constructor to register itself
   // for receiving data via SetGamepadData. The fetcher must remain
   // alive while the provider is calling SetGamepadData on it.
   virtual void RegisterGamepadDataFetcher(GvrGamepadDataFetcher*) = 0;
 };
 
 }  // namespace device
 #endif  // DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H