Add coverage

tools/telemetry/third_party/coverage/doc/api_coverage.rst

Index: tools/telemetry/third_party/coverage/doc/api_coverage.rst
diff --git a/tools/telemetry/third_party/coverage/doc/api_coverage.rst b/tools/telemetry/third_party/coverage/doc/api_coverage.rst
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+.. Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+.. For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+.. _api_coverage:
+
+The Coverage class
+------------------
+
+.. :history: 20150802T174800, new file for 4.0b1
+
+.. module:: coverage
+
+.. autoclass:: Coverage
+    :members:
+    :exclude-members: use_cache, sys_info
+    :special-members: __init__
+
+
+Starting coverage.py automatically
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This function is used to start coverage measurement automatically when Python
+starts.  See :ref:`subprocess` for details.
+
+.. autofunction:: process_startup