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

tracing/trace_viewer.gypi

Index: tracing/trace_viewer.gypi
diff --git a/tracing/trace_viewer.gypi b/tracing/trace_viewer.gypi
index b4398cf8ee113fe1efd02c34a48a50cab2973a10..477b2019cf92f4020ee7aea8d678f345e88f0064 100644
--- a/tracing/trace_viewer.gypi
+++ b/tracing/trace_viewer.gypi
@@ -32,7 +32,6 @@
       '../third_party/polymer/components/polymer/polymer.html',
       'tracing/base/base.html',
       'tracing/base/base64.html',
-      'tracing/base/bbox2.html',
       'tracing/base/category_util.html',
       'tracing/base/color.html',
       'tracing/base/color_scheme.html',
@@ -46,20 +45,21 @@
       'tracing/base/guid.html',
       'tracing/base/interval_tree.html',
       'tracing/base/iteration_helpers.html',
-      'tracing/base/math.html',
+      'tracing/base/math/bbox2.html',
+      'tracing/base/math/math.html',
+      'tracing/base/math/piecewise_linear_function.html',
+      'tracing/base/math/quad.html',
+      'tracing/base/math/range.html',
+      'tracing/base/math/range_utils.html',
+      'tracing/base/math/rect.html',
+      'tracing/base/math/running_statistics.html',
+      'tracing/base/math/sorted_array_utils.html',
+      'tracing/base/math/statistics.html',
       'tracing/base/multi_dimensional_view.html',
-      'tracing/base/piecewise_linear_function.html',
-      'tracing/base/quad.html',
       'tracing/base/raf.html',
-      'tracing/base/range.html',
-      'tracing/base/range_utils.html',
-      'tracing/base/rect.html',
-      'tracing/base/running_statistics.html',
       'tracing/base/scalar.html',
       'tracing/base/settings.html',
       'tracing/base/sinebow_color_generator.html',
-      'tracing/base/sorted_array_utils.html',
-      'tracing/base/statistics.html',
       'tracing/base/task.html',
       'tracing/base/time_display_modes.html',
       'tracing/base/timing.html',