Reland r288013: First cut at "content handling" support in Mojo.

mojo/services/public/interfaces/content_handler/content_handler.mojom

Index: mojo/services/public/interfaces/content_handler/content_handler.mojom
diff --git a/mojo/public/interfaces/application/application.mojom b/mojo/services/public/interfaces/content_handler/content_handler.mojom
similarity index 54%
copy from mojo/public/interfaces/application/application.mojom
copy to mojo/services/public/interfaces/content_handler/content_handler.mojom
index 8828903c9405faa379733ae1a1e951cbf717cdbb..6c07580e30a0c81b767fb1b618cddbe4cb586aa5 100644
--- a/mojo/public/interfaces/application/application.mojom
+++ b/mojo/services/public/interfaces/content_handler/content_handler.mojom
@@ -3,14 +3,14 @@
 // found in the LICENSE file.
 
 import "mojo/public/interfaces/application/service_provider.mojom"
+import "mojo/services/public/interfaces/network/url_loader.mojom"
 
 module mojo {
 
-// Applications vend Services through the ServiceProvider interface. Services
-// implement Interfaces.
-[Client=Shell]
-interface Application {
-  AcceptConnection(string requestor_url, ServiceProvider provider);
+interface ContentHandler {
+  OnConnect(string url,
+            URLResponse url_response,
+            ServiceProvider service_provider);
 };
 
 }