Allow ApplicationTestBase clients to avoid a default MessageLoop.

mojo/public/cpp/application/application_test_base.h

Index: mojo/public/cpp/application/application_test_base.h
diff --git a/mojo/public/cpp/application/application_test_base.h b/mojo/public/cpp/application/application_test_base.h
index 04580c76893a5cb1de23a895c9be6ae40ad69a28..c355117e6e5d2887763fb18a26079d2fad3b637f 100644
--- a/mojo/public/cpp/application/application_test_base.h
+++ b/mojo/public/cpp/application/application_test_base.h
@@ -45,6 +45,11 @@ class ApplicationTestBase : public testing::Test {
   void SetUp() override;
   void TearDown() override;
 
+  // True by default, which indicates a MessageLoop will automatically be
+  // created for the application.  Tests may override this function to prevent
+  // a default loop from being created.
+  virtual bool IsDefaultLoopEnabled();

[sky, 2014/12/16 03:47:36]

This name is a bit confusing. How about ShouldCreateDefaultRunLoop().

[DaleCurtis, 2014/12/16 19:26:12]

Done.

+
  private:
   // The application implementation instance, reconstructed for each test.
   ApplicationImpl* application_impl_;