[tracing] Move math utilities from base into their own subdirectory (attempt 2)

trace_processor/experimental/mappers/scheduling/map_input_blockers.html

Index: trace_processor/experimental/mappers/scheduling/map_input_blockers.html
diff --git a/trace_processor/experimental/mappers/scheduling/map_input_blockers.html b/trace_processor/experimental/mappers/scheduling/map_input_blockers.html
index 34b16a3b4b3ebb87569899c3a71bb2c5c20bba77..50ff3867d93a0ecb74f9bb5711776451638d746a 100644
--- a/trace_processor/experimental/mappers/scheduling/map_input_blockers.html
+++ b/trace_processor/experimental/mappers/scheduling/map_input_blockers.html
@@ -6,7 +6,7 @@ found in the LICENSE file.
 -->
 
 <link rel="import" href="/perf_insights/mre/function_handle.html">
-<link rel="import" href="/tracing/base/range.html">
+<link rel="import" href="/tracing/base/math/range.html">
 <link rel="import" href="/tracing/model/helpers/chrome_model_helper.html">
 
 <script>
@@ -45,13 +45,13 @@ tr.exportTo('pie', function() {
         // Now we can derive the queueing interval from the flow event.
         var flowEvent = event.inFlowEvents[0];
         var queueRange =
-            tr.b.Range.fromExplicitRange(flowEvent.start, event.start);
+            tr.b.math.Range.fromExplicitRange(flowEvent.start, event.start);
 
         // Find all events that intersect the queueing interval and compute how
         // much they contributed to it.
         for (var intersectingEvent of mainThread.getDescendantEvents()) {
           var eventRange =
-              tr.b.Range.fromExplicitRange(intersectingEvent.start,
+              tr.b.math.Range.fromExplicitRange(intersectingEvent.start,
                   intersectingEvent.start + intersectingEvent.duration);
           var intersection = queueRange.findIntersection(eventRange);
           if (intersection.isEmpty || intersection.duration === 0)