Paint buffered range closest to the current play position

Source/core/html/TimeRangesTest.cpp

Index: Source/core/html/TimeRangesTest.cpp
diff --git a/Source/core/html/TimeRangesTest.cpp b/Source/core/html/TimeRangesTest.cpp
index aab2e9d4ffb3065a0ebc3d4861634e1de7679ede..146f6c85b964fcee4866bfc39288d5a52c350358 100644
--- a/Source/core/html/TimeRangesTest.cpp
+++ b/Source/core/html/TimeRangesTest.cpp
@@ -318,3 +318,21 @@ TEST(TimeRanges, Nearest)
     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));
+}