[Android] Sets up a coverage system for java using EMMA

build/android/pylib/instrumentation/setup.py

 # Copyright 2013 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.
 
 """Generates test runner factory and tests for instrumentation tests."""
 
 import logging
 import os
 
 from pylib import android_commands
 from pylib import constants
 from pylib.base import base_test_result
 from pylib.utils import report_results
 
 import test_package
 import test_runner
 
 
 def Setup(test_apk_path, test_apk_jar_path, annotations, exclude_annotations,
           test_filter, build_type, test_data, install_apk, save_perf_json,
           screenshot_failures, tool, wait_for_debugger, disable_assertions,
-          push_deps, cleanup_test_files):
+          push_deps, cleanup_test_files, coverage_dir):
   """Create and return the test runner factory and tests.
 
   Args:
     test_apk_path: Path to the test apk file.
     test_apk_jar_path: Path to the jar associated with the test apk.
     annotations: Annotations for the tests.
     exclude_annotations: Any annotations to exclude from running.
     test_filter: Filter string for tests.
     build_type: 'Release' or 'Debug'.
     test_data: Location of the test data.
     install_apk: Re-installs the apk if opted.
     save_perf_json: Whether or not to save the JSON file from UI perf tests.
     screenshot_failures: Take a screenshot for a test failure
     tool: Name of the Valgrind tool.
     wait_for_debugger: blocks until the debugger is connected.
     disable_assertions: Whether to disable java assertions on the device.
     push_deps: If True, push all dependencies to the device.
     cleanup_test_files: Whether or not to cleanup test files on device.
+    coverage_dir: Directory to pull all EMMA coverage files into, or None if
+        coverage is not being used.
 
   Returns:
     A tuple of (TestRunnerFactory, tests).
   """
   test_pkg = test_package.TestPackage(test_apk_path, test_apk_jar_path)
   tests = test_pkg._GetAllMatchingTests(annotations, exclude_annotations,
                                         test_filter)
   if not tests:
     logging.error('No instrumentation tests to run with current args.')
 
   def TestRunnerFactory(device, shard_index):
     return test_runner.TestRunner(
         build_type, test_data, install_apk, save_perf_json, screenshot_failures,
         tool, wait_for_debugger, disable_assertions, push_deps,
-        cleanup_test_files, device, shard_index, test_pkg, [])
+        cleanup_test_files, device, shard_index, test_pkg, [], coverage_dir)
 
   return (TestRunnerFactory, tests)