Add script for generating coverage.py commands.

It's only correct for Linux for now.

Bug: chromium:844647
Change-Id: I8fce28d88a4d060553e30fe0862d34815988ba61
Reviewed-on: https://webrtc-review.googlesource.com/79149
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23418}

tools_webrtc/coverage/generate_coverage_command.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+# Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+"""Generates a command-line for coverage.py. Useful for manual coverage runs.
+
+Before running the generated command line, do this:
+
+gn gen out/coverage --args='use_clang_coverage=true is_component_build=false'
+"""
+
+import sys
+
+TESTS = [
+  'video_capture_tests',
+  'webrtc_nonparallel_tests',
+  'video_engine_tests',
+  'tools_unittests',
+  'test_support_unittests',
+  'system_wrappers_unittests',
+  'rtc_unittests',
+  'rtc_stats_unittests',
+  'rtc_pc_unittests',
+  'rtc_media_unittests',
+  'peerconnection_unittests',
+  'ortc_unittests',
+  'modules_unittests',
+  'modules_tests',
+  'low_bandwidth_audio_test',
+  'common_video_unittests',
+  'common_audio_unittests',
+  'audio_decoder_unittests'
+]
+
+def main():
+  cmd = ([sys.executable, 'tools/code_coverage/coverage.py'] + TESTS +
+         ['-b out/coverage', '-o out/report'] +
+         ['-i=\'.*/out/.*|.*/third_party/.*\''] +
+         ['-c \'out/coverage/%s\'' % t for t in TESTS])
+
+  def WithXvfb(binary):
+    return '-c \'%s testing/xvfb.py %s\'' % (sys.executable, binary)
+  modules_unittests = 'out/coverage/modules_unittests'
+  cmd[cmd.index('-c \'%s\'' % modules_unittests)] = WithXvfb(modules_unittests)
+
+  print ' '.join(cmd)
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(main())