Add coverage

tools/telemetry/third_party/coverage/coverage/backward.py

Index: tools/telemetry/third_party/coverage/coverage/backward.py
diff --git a/tools/telemetry/third_party/coverage/coverage/backward.py b/tools/telemetry/third_party/coverage/coverage/backward.py
new file mode 100644
index 0000000000000000000000000000000000000000..7f571c077d6eb4426120f8ee79bf8b05a40a3816
--- /dev/null
+++ b/tools/telemetry/third_party/coverage/coverage/backward.py
@@ -0,0 +1,169 @@
+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+"""Add things to old Pythons so I can pretend they are newer."""
+
+# This file does lots of tricky stuff, so disable a bunch of pylint warnings.
+# pylint: disable=redefined-builtin
+# pylint: disable=unused-import
+# pylint: disable=no-name-in-module
+
+import sys
+
+from coverage import env
+
+
+# Pythons 2 and 3 differ on where to get StringIO.
+try:
+    from cStringIO import StringIO
+except ImportError:
+    from io import StringIO
+
+# In py3, ConfigParser was renamed to the more-standard configparser
+try:
+    import configparser
+except ImportError:
+    import ConfigParser as configparser
+
+# What's a string called?
+try:
+    string_class = basestring
+except NameError:
+    string_class = str
+
+# What's a Unicode string called?
+try:
+    unicode_class = unicode
+except NameError:
+    unicode_class = str
+
+# Where do pickles come from?
+try:
+    import cPickle as pickle
+except ImportError:
+    import pickle
+
+# range or xrange?
+try:
+    range = xrange
+except NameError:
+    range = range
+
+# A function to iterate listlessly over a dict's items.
+try:
+    {}.iteritems
+except AttributeError:
+    def iitems(d):
+        """Produce the items from dict `d`."""
+        return d.items()
+else:
+    def iitems(d):
+        """Produce the items from dict `d`."""
+        return d.iteritems()
+
+# Getting the `next` function from an iterator is different in 2 and 3.
+try:
+    iter([]).next
+except AttributeError:
+    def iternext(seq):
+        """Get the `next` function for iterating over `seq`."""
+        return iter(seq).__next__
+else:
+    def iternext(seq):
+        """Get the `next` function for iterating over `seq`."""
+        return iter(seq).next
+
+# Python 3.x is picky about bytes and strings, so provide methods to
+# get them right, and make them no-ops in 2.x
+if env.PY3:
+    def to_bytes(s):
+        """Convert string `s` to bytes."""
+        return s.encode('utf8')
+
+    def binary_bytes(byte_values):
+        """Produce a byte string with the ints from `byte_values`."""
+        return bytes(byte_values)
+
+    def byte_to_int(byte_value):
+        """Turn an element of a bytes object into an int."""
+        return byte_value
+
+    def bytes_to_ints(bytes_value):
+        """Turn a bytes object into a sequence of ints."""
+        # In Python 3, iterating bytes gives ints.
+        return bytes_value
+
+else:
+    def to_bytes(s):
+        """Convert string `s` to bytes (no-op in 2.x)."""
+        return s
+
+    def binary_bytes(byte_values):
+        """Produce a byte string with the ints from `byte_values`."""
+        return "".join(chr(b) for b in byte_values)
+
+    def byte_to_int(byte_value):
+        """Turn an element of a bytes object into an int."""
+        return ord(byte_value)
+
+    def bytes_to_ints(bytes_value):
+        """Turn a bytes object into a sequence of ints."""
+        for byte in bytes_value:
+            yield ord(byte)
+
+
+try:
+    # In Python 2.x, the builtins were in __builtin__
+    BUILTINS = sys.modules['__builtin__']
+except KeyError:
+    # In Python 3.x, they're in builtins
+    BUILTINS = sys.modules['builtins']
+
+
+# imp was deprecated in Python 3.3
+try:
+    import importlib
+    import importlib.util
+    imp = None
+except ImportError:
+    importlib = None
+
+# We only want to use importlib if it has everything we need.
+try:
+    importlib_util_find_spec = importlib.util.find_spec
+except Exception:
+    import imp
+    importlib_util_find_spec = None
+
+# What is the .pyc magic number for this version of Python?
+try:
+    PYC_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER
+except AttributeError:
+    PYC_MAGIC_NUMBER = imp.get_magic()
+
+
+def import_local_file(modname):
+    """Import a local file as a module.
+
+    Opens a file in the current directory named `modname`.py, imports it
+    as `modname`, and returns the module object.
+
+    """
+    try:
+        from importlib.machinery import SourceFileLoader
+    except ImportError:
+        SourceFileLoader = None
+
+    modfile = modname + '.py'
+    if SourceFileLoader:
+        mod = SourceFileLoader(modname, modfile).load_module()
+    else:
+        for suff in imp.get_suffixes():                 # pragma: part covered
+            if suff[0] == '.py':
+                break
+
+        with open(modfile, 'r') as f:
+            # pylint: disable=undefined-loop-variable
+            mod = imp.load_module(modname, f, modfile, suff)
+
+    return mod