Delete unused coverage recipe code.

infra/bots/recipe_modules/flavor/coverage_flavor.py

-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-
-import datetime
-import default_flavor
-import posixpath
-
-
-"""Utils for running coverage tests."""
-
-
-class CoverageFlavorUtils(default_flavor.DefaultFlavorUtils):
-
-  def step(self, name, cmd, **kwargs):
-    """Run the given step through coverage."""
-    compile_target = 'dm'
-    build_cmd = [self.m.vars.skia_dir.join('tools', 'llvm_coverage_build'),
-                 compile_target]
-    build_env = kwargs.pop('env', {})
-    # We have to use Clang 3.6 because earlier versions do not support the
-    # compile flags we use and 3.7 and 3.8 hit asserts during compilation.
-    build_env['CC'] = '/usr/bin/clang-3.6'
-    build_env['CXX'] = '/usr/bin/clang++-3.6'
-    build_env['GYP_DEFINES'] = (
-        'skia_arch_type=x86_64 '
-        'skia_clang_build=1 '
-        'skia_gpu=0 '
-        'skia_warnings_as_errors=0')
-    self.m.step('build %s' % compile_target,
-                cmd=build_cmd,
-                cwd=self.m.path['checkout'],
-                env=build_env,
-                **kwargs)
-
-    # Slice out the 'key' and 'properties' arguments to be reused.
-    key = []
-    properties = []
-    current = None
-    for i in xrange(0, len(cmd)):
-      if isinstance(cmd[i], basestring) and cmd[i] == '--key':
-        current = key
-      elif isinstance(cmd[i], basestring) and cmd[i] == '--properties':
-        current = properties
-      elif isinstance(cmd[i], basestring) and cmd[i].startswith('--'):
-        current = None
-      if current is not None:
-        current.append(cmd[i])
-
-    results_dir = self.m.vars.skia_out.join('coverage_results')
-    self.create_clean_host_dir(results_dir)
-
-    # Run DM under coverage.
-    report_file_basename = '%s.cov' % self.m.vars.got_revision
-    report_file = results_dir.join(report_file_basename)
-    args = [
-        'python',
-        self.m.vars.skia_dir.join('tools', 'llvm_coverage_run.py'),
-    ] + cmd + ['--outResultsFile', report_file]
-    self.m.run(self.m.step, name=name, cmd=args,
-               cwd=self.m.path['checkout'], **kwargs)
-
-    # Generate nanobench-style JSON output from the coverage report.
-    nanobench_json = results_dir.join('nanobench_%s.json' % (
-        self.m.vars.got_revision))
-    line_by_line_basename = ('coverage_by_line_%s.json' % (
-        self.m.vars.got_revision))
-    line_by_line = results_dir.join(line_by_line_basename)
-    args = [
-        'python',
-        self.m.vars.skia_dir.join('tools', 'parse_llvm_coverage.py'),
-        '--report', report_file, '--nanobench', nanobench_json,
-        '--linebyline', line_by_line]
-    args.extend(key)
-    args.extend(properties)
-    self.m.run(
-        self.m.step,
-        'Generate Coverage Data',
-        cmd=args, cwd=self.m.path['checkout'])
-
-    # Copy files from results_dir into swarming_out_dir.
-    for r in self.m.file.listdir('results_dir', results_dir):
-      self.m.file.copy(
-          'Copy to swarming out', results_dir.join(r),
-          self.m.vars.swarming_out_dir)