Add a mojo::RunApplication() for running implementations of ApplicationImplBase.

services/test_service/test_time_service_impl.h

Index: services/test_service/test_time_service_impl.h
diff --git a/services/test_service/test_time_service_impl.h b/services/test_service/test_time_service_impl.h
index 5ca569bc7c671387e06c589e87c71b9b734b7f6f..27a028f6ce10745876ac60e206e452fb11f70ad1 100644
--- a/services/test_service/test_time_service_impl.h
+++ b/services/test_service/test_time_service_impl.h
@@ -12,13 +12,16 @@
 #include "services/test_service/test_service.mojom.h"
 
 namespace mojo {
+
+class ApplicationImplBase;
+
 namespace test {
 
 class TrackedService;
 
 class TestTimeServiceImpl : public TestTimeService {
  public:
-  TestTimeServiceImpl(ApplicationImpl* app_impl,
+  TestTimeServiceImpl(ApplicationImplBase* application,
                       InterfaceRequest<TestTimeService> request);
   ~TestTimeServiceImpl() override;
 
@@ -28,7 +31,7 @@ class TestTimeServiceImpl : public TestTimeService {
   void StartTrackingRequests(const mojo::Callback<void()>& callback) override;
 
  private:
-  ApplicationImpl* app_impl_;
+  ApplicationImplBase* const application_;
   scoped_ptr<TrackedService> tracking_;
   StrongBinding<TestTimeService> binding_;
   MOJO_DISALLOW_COPY_AND_ASSIGN(TestTimeServiceImpl);