Port EMMA Java code coverage build rules to GN

build/config/android/rules.gni

 # 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("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 1054 matching lines @@
 #   dex_path: If set, the resulting .dex.jar file will be placed under this
 #     path.
 #
 #   alternative_android_sdk_ijar: if set, the given android_sdk_ijar file
 #     replaces the default android_sdk_ijar.
 #
 #   alternative_android_sdk_ijar_dep: the target that generates
 #      alternative_android_sdk_ijar, must be set if alternative_android_sdk_ijar
 #      is used.
 #
+#   emma_never_instrument: Disables EMMA Java code coverage for this target.
+#
 # Example
 #   android_library("foo_java") {
 #     java_files = [
 #       "android/org/chromium/foo/Foo.java",
 #       "android/org/chromium/foo/FooInterface.java",
 #       "android/org/chromium/foo/FooService.java",
 #     ]
 #     deps = [
 #       ":bar_java"
 #     ]
@@ skipping 273 matching lines @@
 
   # Help GN understand that _create_abi_split is not unused (bug in GN).
   assert(_create_abi_split || true)
 
   _proguard_enabled =
       defined(invoker.proguard_enabled) && invoker.proguard_enabled
   if (_proguard_enabled) {
     _proguard_jar_path = "$base_path.proguard.jar"
   }
 
+  _emma_never_instrument = defined(invoker.testonly) && invoker.testonly
+
   build_config_target = "${_template_name}__build_config"
   write_build_config(build_config_target) {
     forward_variables_from(invoker, [ "apk_under_test" ])
     type = "android_apk"
     jar_path = _jar_path
     dex_path = final_dex_path
     resources_zip = resources_zip_path
     build_config = _build_config
     android_manifest = _android_manifest
 
@@ skipping 93 matching lines @@
     if (defined(invoker.java_files)) {
       java_files = invoker.java_files
     } else if (defined(invoker.DEPRECATED_java_in_dir)) {
       DEPRECATED_java_in_dir = invoker.DEPRECATED_java_in_dir
     } else {
       java_files = []
     }
     srcjar_deps = _srcjar_deps
     jar_path = _jar_path
     dex_path = _lib_dex_path
+    emma_never_instrument = _emma_never_instrument
 
     if (defined(invoker.deps)) {
       deps += invoker.deps
     }
   }
 
   if (_dist_jar_path != "") {
     create_dist_target = "${_template_name}__create_dist_jar"
     _final_deps += [ ":$create_dist_target" ]
 
@@ skipping 61 matching lines @@
 
   dex("$final_dex_target_name") {
     deps = _dex_deps + [ ":$build_config_target" ]
     inputs = [
       _build_config,
     ]
     sources = _dex_sources
     output = final_dex_path
     _dex_arg_key = "${_rebased_build_config}:final_dex:dependency_dex_files"
     args = [ "--inputs=@FileArg($_dex_arg_key)" ]
+
+    if (emma_coverage && !_emma_never_instrument) {
+      no_locals = true
+      sources += [ "$android_sdk_root/tools/lib/emma_device.jar" ]
+    }
   }
 
   if (_native_libs != []) {
     _prepare_native_target_name = "${_template_name}__prepare_native"
     action(_prepare_native_target_name) {
       forward_variables_from(invoker,
                              [
                                "data_deps",
                                "public_deps",
                              ])
@@ skipping 59 matching lines @@
                              "language_splits",
                              "shared_resources",
                            ])
     apk_path = _final_apk_path
     android_manifest = _android_manifest
     assets_build_config = _build_config
     resources_zip = _all_resources_zip_path
     dex_path = final_dex_path
     load_library_from_apk = _load_library_from_apk
     create_density_splits = _create_density_splits
+    emma_instrument = emma_coverage && !_emma_never_instrument
 
     if (!defined(extensions_to_not_compress)) {
       # Allow icu data, v8 snapshots, and pak files to be loaded directly from
       # the .apk.
       # Note: These are actually suffix matches, not necessarily extensions.
       extensions_to_not_compress = ".dat,.bin,.pak"
     }
 
     version_code = _version_code
     version_name = _version_name
@@ skipping 522 matching lines @@
   }
 
   android_library(target_name) {
     java_files = []
     srcjar_deps = [ ":${_template_name}__protoc_java" ]
     deps = [
       "//third_party/android_protobuf:protobuf_nano_javalib",
     ]
   }
 }