VR: Use more accurate timestamps for input events.

chrome/browser/android/vr_shell/vr_controller.h

Index: chrome/browser/android/vr_shell/vr_controller.h
diff --git a/chrome/browser/android/vr_shell/vr_controller.h b/chrome/browser/android/vr_shell/vr_controller.h
index de6d03b7b2395a5959520ae5941c2d272412c776..8bcc6c18a63af32f653f1f10c4379294a97c4ca9 100644
--- a/chrome/browser/android/vr_shell/vr_controller.h
+++ b/chrome/browser/android/vr_shell/vr_controller.h
@@ -9,6 +9,7 @@
 #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"
@@ -80,6 +81,10 @@ class VrController {
 
   bool IsConnected();
 
+  base::TimeTicks GetLastOrientationTimestamp() const;
+  base::TimeTicks GetLastTouchTimestamp() const;
+  base::TimeTicks GetLastButtonTimestamp() const;
+
  private:
   enum GestureDetectorState {
     WAITING,   // waiting for user to touch down