Add Media Router JS Gin module.

extensions/renderer/resources/extensions_renderer_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <grit latest_public_release="0" current_release="1">
   <outputs>
     <output filename="grit/extensions_renderer_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
     </output>
     <output filename="extensions_renderer_resources.pak" type="data_package" />
   </outputs>
   <release seq="1">
     <includes>
@@ skipping 75 matching lines @@
 
       <!-- Custom types for APIs. -->
       <include name="IDR_STORAGE_AREA_JS" file="storage_area.js" type="BINDATA" />
 
       <!-- Platform app support. -->
       <include name="IDR_PLATFORM_APP_CSS" file="platform_app.css" type="BINDATA" />
       <include name="IDR_PLATFORM_APP_JS" file="platform_app.js" type="BINDATA" />
 
       <!-- 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. -->
       <structure name="IDR_EXTENSION_CSS" file="extension.css" type="chrome_html" flattenhtml="true" />
     </structures>
   </release>
 </grit>