[tools] Add scipy into callstats.py deps

TBR=machenbach@chromium.org

No-Try: true
Bug: chromium:616879
Change-Id: I283e7ae6b867b03f11aed2facc275fe4767ab26c
Reviewed-on: https://chromium-review.googlesource.com/1177388
Commit-Queue: Sergiy Byelozyorov <sergiyb@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55155}

tools/callstats.py.vpython

@@ -28,3 +28,17 @@ wheel: <
   name: "infra/python/wheels/numpy/${vpython_platform}"
   version: "version:1.11.3"
 >
+
+wheel: <
+  name: "infra/python/wheels/scipy/${vpython_platform}"
+  version: "version:0.19.0"
+  match_tag: <
+    platform: "manylinux-x64"
+  >
+  match_tag: <
+    platform: "manylinux-x86"
+  >
+  match_tag: <
+    platform: "mac-x64"
+  >
+>