Add IPC to query capabilities of video input devices.

content/renderer/media/user_media_client_impl_unittest.cc

Index: content/renderer/media/user_media_client_impl_unittest.cc
diff --git a/content/renderer/media/user_media_client_impl_unittest.cc b/content/renderer/media/user_media_client_impl_unittest.cc
index 77214b3bb20394160c9d52bb4523f6e6e8f8bef6..1e6e6e306fe91c5b5a51c8fd3694b2c2b0567f30 100644
--- a/content/renderer/media/user_media_client_impl_unittest.cc
+++ b/content/renderer/media/user_media_client_impl_unittest.cc
@@ -126,6 +126,9 @@ class MockMediaDevicesDispatcherHost
                     const url::Origin& security_origin));
   MOCK_METHOD2(UnsubscribeDeviceChangeNotifications,
                void(MediaDeviceType type, uint32_t subscription_id));
+  MOCK_METHOD2(GetVideoInputCapabilities,
+               void(const url::Origin& security_origin,
+                    const GetVideoInputCapabilitiesCallback& client_callback));
 };
 
 class UserMediaClientImplUnderTest : public UserMediaClientImpl {