patch from chinmaygarde@ to make progress on mac, ios.

base/test/BUILD.gn

 # Copyright (c) 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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 source_set("test_config") {
   # TODO http://crbug.com/412064 enable this flag all the time.
   testonly = !is_component_build
   sources = [
     "test_switches.cc",
     "test_switches.h",
     "test_timeouts.cc",
     "test_timeouts.h",
   ]
   deps = [
     "//base",
   ]
 }
 
 # GYP: //base/base.gyp:test_support_base
-source_set("test_support") {
+static_library("test_support") {

[sdefresne, 2015/07/25 19:15:29]

Why the change from "source_set" to "static_library"? I though that "source_set"
where recommended everywhere with gn. Is this required here?

[Dirk Pranke, 2015/07/31 21:27:40]

source_set is recommended, you're right.

I had initially changed this because the test_support library was pulling in
some files that we didn't need, and changing to a static lib works around that.

I'll go back and separate the files explicitly.

   # TODO http://crbug.com/412064 enable this flag all the time.
   testonly = !is_component_build
   sources = [
     "gtest_util.cc",
     "gtest_util.h",
     "gtest_xml_unittest_result_printer.cc",
     "gtest_xml_unittest_result_printer.h",
     "gtest_xml_util.cc",
     "gtest_xml_util.h",
     "histogram_tester.cc",
@@ skipping 110 matching lines @@
   if (!is_posix) {
     sources -= [
       "scoped_locale.cc",
       "scoped_locale.h",
     ]
   }
   if (is_ios) {
     # iOS uses its own unit test launcher.
     sources -= [ "launcher/unit_test_launcher.cc" ]
 
+    sources -= [ "multiprocess_test.cc" ]
+
     # Pull in specific Mac files for iOS (which have been filtered out
     # by file name rules).
     set_sources_assignment_filter([])
     sources += [ "test_file_util_mac.cc" ]
   }
 
   if (is_android) {
     deps += [ ":base_unittests_jni_headers" ]
   }
 }
@@ skipping 40 matching lines @@
 
 if (is_android) {
   generate_jni("base_unittests_jni_headers") {
     sources = [
       "android/java/src/org/chromium/base/ContentUriTestUtils.java",
       "android/java/src/org/chromium/base/TestUiThread.java",
     ]
     jni_package = "base"
   }
 }