VR: Use more accurate timestamps for input events.

chrome/browser/android/vr_shell/vr_controller.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 CHROME_BROWSER_ANDROID_VR_SHELL_VR_CONTROLLER_H_
 #define CHROME_BROWSER_ANDROID_VR_SHELL_VR_CONTROLLER_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
+#include "base/time/time.h"
 #include "chrome/browser/android/vr_shell/vr_controller_model.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
 #include "third_party/gvr-android-sdk/src/libraries/headers/vr/gvr/capi/include/gvr_types.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/quaternion.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 
 namespace blink {
 class WebGestureEvent;
@@ skipping 51 matching lines @@
   bool TouchDownHappened();
 
   bool TouchUpHappened();
 
   bool ButtonUpHappened(gvr::ControllerButton button);
   bool ButtonDownHappened(gvr::ControllerButton button);
   bool ButtonState(gvr::ControllerButton button) const;
 
   bool IsConnected();
 
+  base::TimeTicks GetLastOrientationTimestamp() const;
+  base::TimeTicks GetLastTouchTimestamp() const;
+  base::TimeTicks GetLastButtonTimestamp() const;
+
  private:
   enum GestureDetectorState {
     WAITING,   // waiting for user to touch down
     TOUCHING,  // touching the touch pad but not scrolling
     SCROLLING  // scrolling on the touch pad
   };
 
   struct TouchPoint {
     gfx::Vector2dF position;
     int64_t timestamp;
@@ skipping 91 matching lines @@
   int extrapolated_touch_ = 0;
 
   std::unique_ptr<ElbowModel> elbow_model_;
 
   DISALLOW_COPY_AND_ASSIGN(VrController);
 };
 
 }  // namespace vr_shell
 
 #endif  // CHROME_BROWSER_ANDROID_VR_SHELL_VR_CONTROLLER_H_