views/mus: Install a mus-friend ContextFactory for tests.

mash/test/mash_test_suite.h

Index: mash/test/mash_test_suite.h
diff --git a/mash/test/mash_test_suite.h b/mash/test/mash_test_suite.h
index 8bfa7bd5db82633e916bc1dafe3b7762976cbcd9..cff22147f55f26a175b2f0ddd3cb977b294a06c0 100644
--- a/mash/test/mash_test_suite.h
+++ b/mash/test/mash_test_suite.h
@@ -13,12 +13,15 @@
 
 namespace aura {
 class Env;
+namespace test {
+class TestContextFactory;
+}
 }
 
 namespace mash {
 namespace test {
 
-class TestContextFactory;
+class TestContextFactoryPrivate;
 
 class MashTestSuite : public base::TestSuite {
  public:
@@ -33,7 +36,8 @@ class MashTestSuite : public base::TestSuite {
  private:
   base::TestDiscardableMemoryAllocator discardable_memory_allocator_;
   std::unique_ptr<aura::Env> env_;
-  std::unique_ptr<TestContextFactory> compositor_context_factory_;
+  std::unique_ptr<aura::test::TestContextFactory> context_factory_;
+  std::unique_ptr<TestContextFactoryPrivate> context_factory_private_;
 
   DISALLOW_COPY_AND_ASSIGN(MashTestSuite);
 };