[Android] Add Activity#finishAfterTransition to ApiCompatibilityUtils.

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

Index: base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
diff --git a/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java b/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
index 76d73967d49c891b45f4552ea388c0c86cf9f5d4..b3eff94e81d69888712ea5aa535e66d4f734a446 100644
--- a/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
+++ b/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
@@ -404,4 +404,15 @@ public class ApiCompatibilityUtils {
             return res.getDrawableForDensity(id, density);
         }
     }
+
+    /**
+     * @see android.app.Activity#finishAfterTransition().
+     */
+    public static void finishAfterTransition(Activity activity) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+            activity.finishAfterTransition();
+        } else {
+            activity.finish();
+        }
+    }
 }