Adds ability for ash_unittests to run in mushrome mode

ash/test/ash_test_suite.cc

Index: ash/test/ash_test_suite.cc
diff --git a/ash/test/ash_test_suite.cc b/ash/test/ash_test_suite.cc
index 9b141b8f399f7c0b54ec35eabd7a8c928112991b..f1ff980466220a1b220a4094f3d147be099cdf2d 100644
--- a/ash/test/ash_test_suite.cc
+++ b/ash/test/ash_test_suite.cc
@@ -4,7 +4,9 @@
 
 #include "ash/test/ash_test_suite.h"
 
+#include "ash/public/cpp/config.h"
 #include "ash/test/ash_test_environment.h"
+#include "ash/test/ash_test_helper.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/i18n/rtl.h"
@@ -13,6 +15,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
+#include "ui/compositor/test/fake_context_factory.h"
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gl/test/gl_surface_test_support.h"
 
@@ -54,8 +57,20 @@ void AshTestSuite::Initialize() {
         ash_test_resources_200, ui::SCALE_FACTOR_200P);
   }
 
+  const bool is_classic =

[msw, 2017/03/30 23:06:05]

optional nit: is_mus would be a one-liner.

[sky, 2017/03/30 23:35:46]

Nice!

+      !base::CommandLine::ForCurrentProcess()->HasSwitch("mus");
+  ash::test::AshTestHelper::config_ =
+      is_classic ? Config::CLASSIC : Config::MUS;
+
   base::DiscardableMemoryAllocator::SetInstance(&discardable_memory_allocator_);
-  env_ = aura::Env::CreateInstance();
+  env_ = aura::Env::CreateInstance(is_classic ? aura::Env::Mode::LOCAL
+                                              : aura::Env::Mode::MUS);
+
+  if (!is_classic) {
+    context_factory_ = base::MakeUnique<ui::FakeContextFactory>();
+    env_->set_context_factory(context_factory_.get());
+    env_->set_context_factory_private(nullptr);
+  }
 }
 
 void AshTestSuite::Shutdown() {