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* Fix include:
   1) handle cases thread_times = None
   2) disable testBlinkPerfTracingMetricsForMeasureTime on Win

This CL adds support for tracing metrics with measureTime &
measureFrameTime methods in blink_perf harness.

If a test has "tracingCategories" & "traceEventsToMeasure" fields
specified, Telemetry will enable the specified tracing categories &
compute the cpu time of all the specified trace events (one per test
run).

Detailed examples of how to use this new API are in third_party/WebKit/PerformanceTests/TestData/

BUG=701059, 715822

TBR=wangxianzhu@chromium.org

Reviewer: you can see this in action by patching this CL & run:
./tools/perf/run_benchmark --browser=system blink_perf.testing --story-filter=frame --output-format=json
[ RUN      ] append-child-measure-time.html
...
...
CPU times of trace event "UpdateLayoutTree":
values 1.8760000000, 3.2080000000, 3.4260000000, 1.9020000000, 1.6990000000, 2.2940000000, 1.8570000000, 1.7100000000, 1.4170000000, 1.4150000000 ms
avg 2.0804000000 ms

CPU times of trace event "FrameView::layout":
values 4.6150000000, 8.3140000000, 8.6080000000, 4.4360000000, 4.0940000000, 5.9130000000, 4.5970000000, 3.9440000000, 3.4590000000, 3.4600000000 ms
avg 5.1440000000 ms
[ RUN      ] color-changes-measure-frame-time.html
...
...
CPU times of trace event "FrameView::prePaint":
values 5.9890000000, 5.9640000000, 6.2360000000, 6.3870000000, 5.9490000000, 6.3450000000, 6.3340000000, 6.9270000000, 6.8910000000 ms
avg 6.3357777778 ms

CPU times of trace event "FrameView::paintTree":
values 30.0950000000, 30.5020000000, 30.6510000000, 30.3380000000, 30.4160000000, 30.3480000000, 30.5110000000, 30.7570000000, 30.6140000000 ms
avg 30.4702222222 ms

After running the command above, the command also produces 2 trace files
locally, one for each test.

Review-Url: https://codereview.chromium.org/2819343002
Cr-Commit-Position: refs/heads/master@{#467445}
Committed: https://chromium.googlesource.com/chromium/src/+/0d2d43615b4553f00ac711f54dbcc0835f04366b

patch from issue 2819343002 at patchset 270001 (http://crrev.com/2819343002#ps270001)

Review-Url: https://codereview.chromium.org/2844133002
Cr-Commit-Position: refs/heads/master@{#467637}