[vr] Use base's time classes

chrome/browser/android/vr_shell/animation.h

Index: chrome/browser/android/vr_shell/animation.h
diff --git a/chrome/browser/android/vr_shell/animation.h b/chrome/browser/android/vr_shell/animation.h
index 2f6304adcceab0024aad476b4f6656c0658edec1..084f4582d54cb75663d37e445143b5d43dc2c6a3 100644
--- a/chrome/browser/android/vr_shell/animation.h
+++ b/chrome/browser/android/vr_shell/animation.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/time/time.h"
 
 namespace vr_shell {
 
@@ -35,8 +36,8 @@ class Animation {
             std::unique_ptr<easing::Easing> easing,
             std::vector<float> from,
             std::vector<float> to,
-            int64_t start,
-            int64_t duration);
+            const base::TimeTicks& start,
+            const base::TimeDelta& duration);
   ~Animation();
 
   int id;
@@ -44,8 +45,8 @@ class Animation {
   std::unique_ptr<easing::Easing> easing;
   std::vector<float> from;
   std::vector<float> to;
-  int64_t start;
-  int64_t duration;
+  base::TimeTicks start;
+  base::TimeDelta duration;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Animation);