Add coverage

tools/telemetry/third_party/coverage/tests/farm/html/src/b.py

+# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
+# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
+
+# A test file for HTML reporting by coverage.py.
+
+def one(x):
+    # This will be a branch that misses the else.
+    if x < 2:
+        a = 3
+    else:
+        a = 4
+
+one(1)
+
+def two(x):
+    # A missed else that branches to "exit"
+    if x:
+        a = 5
+
+two(1)
+
+def three():
+    try:
+        # This if has two branches, *neither* one taken.
+        if name_error_this_variable_doesnt_exist:
+            a = 1
+        else:
+            a = 2
+    except:
+        pass
+
+three()