Update to latest trace-viewer

Includes per-app frame track, and several new android alerts.

Change-Id: I9b4fbf6c88ed98d35e3e6fb8d0bbd15fa1c635de
diff --git a/update.py b/update.py
index 95d0bed..abcad9e 100755
--- a/update.py
+++ b/update.py
@@ -21,7 +21,7 @@
   # Remove the old source tree.
   shutil.rmtree(trace_viewer_dir, True)
 
-  # Pull the latest source from the upstream svn.
+  # Pull the latest source from the upstream git.
   git_args = ['git', 'clone', upstream_git, trace_viewer_dir]
   p = subprocess.Popen(git_args, stdout=subprocess.PIPE, cwd=script_dir)
   p.communicate()