Add systrace to the SDK.

(cherry picked from commit 94233e393842cc7eed7b26fe409469c855263787)

Change-Id: I28eedda734ef6af5cab60bb0695c1cc664465cd6
diff --git a/build/tools.atree b/build/tools.atree
index afdeb75..d075fc1 100644
--- a/build/tools.atree
+++ b/build/tools.atree
@@ -161,6 +161,15 @@
 # tools specific support jar
 framework/annotations.jar   tools/support/annotations.jar
 
+# systrace
+external/chromium-trace/systrace.py    tools/systrace/systrace.py
+external/chromium-trace/script.js      tools/systrace/script.js
+external/chromium-trace/style.css      tools/systrace/style.css
+external/chromium-trace/LICENSE        tools/systrace/LICENSE
+external/chromium-trace/AUTHORS        tools/systrace/AUTHORS
+
+
+
 ##############################################################################
 # Tests Component
 ##############################################################################