Merge remote branch 'cros/upstream' into autotest-rebase

Merged to upstream trunk@5066, from trunk@4749.

There is no way I could enlist each individual CL from the upstream here since it will blow up the changelist description field.

BUG=
TEST=
Had patched this CL into a fresh cut client to avoid any side effect.
run_remote_test bvt from both emerged location and third_party/autotest/file.

Both test passed!

We should also keep any eye on this to see how it gets propagated into cautotest server.
TBR=dalecurtis

Change-Id: I72f2bc7a9de530178484aea1bfb5ace68bcad029
diff --git a/client/tests/tracing_microbenchmark/tracers.py b/client/tests/tracing_microbenchmark/tracers.py
index bdd5194..08ca7e3 100644
--- a/client/tests/tracing_microbenchmark/tracers.py
+++ b/client/tests/tracing_microbenchmark/tracers.py
@@ -56,5 +56,5 @@
                 cpu_key = '%s_%s' % (cpu, key)
                 total_key = 'total_' + key
                 results[cpu_key] = val
-                results[total_key] = (results.get(total_key, 0) + 
+                results[total_key] = (results.get(total_key, 0) +
                                       results[cpu_key])