Address NewApi lint warnings in base.

base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java

Index: base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java
diff --git a/base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java b/base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java
index ad5cdd815bfcf81fe85952085f4f1656b04f185a..d4b0d98d19dd7bbca94a975489d1367539f0574c 100644
--- a/base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java
+++ b/base/android/java/src/org/chromium/base/AnimationFrameTimeHistogram.java
@@ -9,6 +9,8 @@ import android.animation.Animator.AnimatorListener;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.TimeAnimator;
 import android.animation.TimeAnimator.TimeListener;
+import android.annotation.TargetApi;
+import android.os.Build;
 import android.util.Log;
 
 /**
@@ -80,6 +82,9 @@ public class AnimationFrameTimeHistogram {
     /**
      * Record Android animation frame rate and return the result.
      */
+    // Note: TimeAnimator was added to the Android public API in level 16, but has actually been
+    // available since level 14. So, it's safe to use TimeAnimator here, even on ICS.
+    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
     private static class Recorder implements TimeListener {
         // TODO(kkimlabs): If we can use in the future, migrate to Choreographer for minimal
         //                 workload.