Paint buffered range closest to the current play position

Source/core/html/TimeRangesTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 300 matching lines @@
     ASSERT_EQ(2, ranges->nearest(3, 0));
     ASSERT_EQ(5, ranges->nearest(4, 0));
     ASSERT_EQ(5, ranges->nearest(5, 0));
     ASSERT_EQ(7, ranges->nearest(8, 0));
 
     ranges->add(9, 11);
     ASSERT_EQ(7, ranges->nearest(8, 6));
     ASSERT_EQ(7, ranges->nearest(8, 8));
     ASSERT_EQ(9, ranges->nearest(8, 10));
 }
+
+TEST(TimeRanges, NearestRange)
+{
+    RefPtrWillBeRawPtr<TimeRanges> ranges = TimeRanges::create();
+    ranges->add(0, 2);
+    ranges->add(5, 7);
+
+    ASSERT_EQ(0u, ranges->nearestRange(0));
+    ASSERT_EQ(0u, ranges->nearestRange(1));
+    ASSERT_EQ(0u, ranges->nearestRange(2));
+    ASSERT_EQ(0u, ranges->nearestRange(3));
+    ASSERT_EQ(1u, ranges->nearestRange(4));
+    ASSERT_EQ(1u, ranges->nearestRange(5));
+    ASSERT_EQ(1u, ranges->nearestRange(8));
+
+    ranges->add(9, 11);
+    ASSERT_EQ(2u, ranges->nearestRange(8));
+}