Video Capture Mojo (1.4a.a): Add service configurator interface

services/video_capture/public/interfaces/BUILD.gn

Index: services/video_capture/public/interfaces/BUILD.gn
diff --git a/services/video_capture/public/interfaces/BUILD.gn b/services/video_capture/public/interfaces/BUILD.gn
index 1e4d90ee29ee5d67622607eea1fdd046a3043c7c..f6c39d67d490f9a45d3f27827dae8b53b3522a99 100644
--- a/services/video_capture/public/interfaces/BUILD.gn
+++ b/services/video_capture/public/interfaces/BUILD.gn
@@ -6,10 +6,12 @@ import("//mojo/public/tools/bindings/mojom.gni")
 
 mojom("interfaces") {
   sources = [
+    "fake_video_capture_device_factory_configurator.mojom",

[yzshen1, 2016/08/16 17:55:08]

is this used only for test? if yes, please consider moving it to a separate
target with testonly set to true.

[chfremer, 2016/08/16 18:34:40]

Contrary to what the name suggests, the fake device functionality is actually
shipped as part of production builds. I'll keep an eye out for test-only stuff,
though, and consider keeping it in separate interfaces.

[yzshen1, 2016/08/17 16:22:54]

Do you mean the fake device functionality is actually used by some production
features? Or it is just built into the production for convenience?

If it is not used by any production features, we should split it out. It helps
to reduce binary size and minimizes the chance of exposing testing functionality
unintentionally.

WDYT?

     "video_capture_device.mojom",
     "video_capture_device_client.mojom",
     "video_capture_device_factory.mojom",
     "video_capture_format.mojom",
+    "video_capture_service.mojom",
   ]
 
   deps = [