[Mojo Video Capture] Stop service when last client disconnects.

services/video_capture/test/service_unittest.cc

Index: services/video_capture/test/service_unittest.cc
diff --git a/services/video_capture/test/service_unittest.cc b/services/video_capture/test/service_unittest.cc
index 8b4b4bf3c7b7bf873e6bca6a490f9d3af9da358a..58aa118fa7c5dd0d642be1c282bbd48ae7ef181d 100644
--- a/services/video_capture/test/service_unittest.cc
+++ b/services/video_capture/test/service_unittest.cc
@@ -5,6 +5,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
 #include "base/test/mock_callback.h"
+#include "services/video_capture/public/interfaces/constants.mojom.h"
 #include "services/video_capture/public/interfaces/device_factory.mojom.h"
 #include "services/video_capture/test/service_test.h"
 
@@ -67,4 +68,22 @@ TEST_F(VideoCaptureServiceTest, ErrorCodeOnCreateDeviceForInvalidDescriptor) {
   wait_loop.Run();
 }
 
+// Tests that the service requests to be closed when the last client disconnects
+// after not having done anything other than obtaining a connection to the
+// fake device factory.
+TEST_F(VideoCaptureServiceTest, ServiceQuitsWhenNoClientConnected) {
+  base::RunLoop wait_loop;
+  EXPECT_CALL(*service_state_observer_, OnServiceStopped(_))
+      .WillOnce(Invoke([&wait_loop](const service_manager::Identity& identity) {
+        if (identity.name() == mojom::kServiceName)
+          wait_loop.Quit();
+      }));
+
+  // Exercise: Disconnect from service by discarding our references to it.
+  factory_.reset();
+  service_.reset();
+
+  wait_loop.Run();
+}
+
 }  // namespace video_capture