diff --git a/build/sdk.atree b/build/sdk.atree
index a39756c26..78090b9b6 100644
--- a/build/sdk.atree
+++ b/build/sdk.atree
@@ -57,8 +57,12 @@ development/sdk/generated-api-versions.xml    platform-tools/api/api-versions.xm
 prebuilts/sdk/sdk-annotations/annotations.zip   platform-tools/api/annotations.zip
 
 # systrace
+external/chromium-trace/agents/__init__.py            platform-tools/systrace/agents/__init__.py
+external/chromium-trace/agents/atrace_agent.py        platform-tools/systrace/agents/atrace_agent.py
 external/chromium-trace/systrace.py                   platform-tools/systrace/systrace.py
 external/chromium-trace/systrace-legacy.py            platform-tools/systrace/systrace-legacy.py
+external/chromium-trace/systrace_agent.py             platform-tools/systrace/systrace_agent.py
+external/chromium-trace/util.py                       platform-tools/systrace/util.py
 external/chromium-trace/systrace_trace_viewer.html    platform-tools/systrace/systrace_trace_viewer.html
 external/chromium-trace/prefix.html                   platform-tools/systrace/prefix.html
 external/chromium-trace/suffix.html                   platform-tools/systrace/suffix.html