Add Media Router JS Gin module.

extensions/renderer/resources/extensions_renderer_resources.grd

Index: extensions/renderer/resources/extensions_renderer_resources.grd
diff --git a/extensions/renderer/resources/extensions_renderer_resources.grd b/extensions/renderer/resources/extensions_renderer_resources.grd
index c9c6299394eadfbf333fa3a1de5c2da3ab685f2b..c0602ccaec075f3debbd5ca1a6a0e400e81ef344 100644
--- a/extensions/renderer/resources/extensions_renderer_resources.grd
+++ b/extensions/renderer/resources/extensions_renderer_resources.grd
@@ -93,6 +93,12 @@
 
       <!-- Extension styles. -->
       <include name="IDR_EXTENSION_FONTS_CSS" file="extension_fonts.css" type="BINDATA"/>
+
+      <!-- Media Router Mojo service and bindings. -->
+      <if expr="enable_media_router">
+        <include name="IDR_MEDIA_ROUTER_MOJOM_JS" file="${mojom_root}\chrome\browser\media\router\media_router.mojom.js" use_base_dir="false" type="BINDATA" />

[Nico, 2017/03/21 19:00:57]

Is extensions/ the right place for this code? Everything else looking at
ENABLE_MEDIA_ROUTER is in chrome/, and this here references chrome/browser from
extensions which seems like a layering violation.

[imcheng, 2017/03/22 23:28:59]

Maybe it should have been. Though longer term we would like to rewrite
MediaRouterAndroid to use the same mojom. Any ideas? Maybe
components/media_router would be a good place?

+        <include name="IDR_MEDIA_ROUTER_BINDINGS_JS" file="media_router_bindings.js" type="BINDATA" />
+      </if>
     </includes>
     <structures>
       <!-- Extension styles. -->