Allow FakeVideoCaptureDeviceFactory to specify number of supported formats per device.

media/capture/video/fake_video_capture_device_factory.h

Index: media/capture/video/fake_video_capture_device_factory.h
diff --git a/media/capture/video/fake_video_capture_device_factory.h b/media/capture/video/fake_video_capture_device_factory.h
index ef510573d645b0c9455e9e1a139b9ee482324bc7..5061a4bec4f69815c2ec4c9f3dde6ba76e14b6a6 100644
--- a/media/capture/video/fake_video_capture_device_factory.h
+++ b/media/capture/video/fake_video_capture_device_factory.h
@@ -36,11 +36,16 @@ class CAPTURE_EXPORT FakeVideoCaptureDeviceFactory
     DCHECK(thread_checker_.CalledOnValidThread());
     return number_of_devices_;
   }
+  int number_of_formats_per_device() {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    return number_of_formats_per_device_;
+  }
 
  private:
   void ParseCommandLine();
 
   int number_of_devices_;
+  int number_of_formats_per_device_;
   FakeVideoCaptureDevice::BufferOwnership fake_vcd_ownership_;
   float frame_rate_;
   bool command_line_parsed_ = false;