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..719958ad5721593a80c1429a4d530bf13d3a65eb 100644
--- a/mash/test/mash_test_suite.h
+++ b/mash/test/mash_test_suite.h
@@ -15,11 +15,13 @@ namespace aura {
 class Env;
 }
 
+namespace ui {
+class FakeContextFactory;
+}
+
 namespace mash {
 namespace test {
 
-class TestContextFactory;
-
 class MashTestSuite : public base::TestSuite {
  public:
   MashTestSuite(int argc, char** argv);
@@ -33,7 +35,7 @@ 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<ui::FakeContextFactory> context_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MashTestSuite);
 };