Implement basic mojo Permission service and use it for Geolocation.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 84a31ba849001026b451f344c400dacf2965db3a..464dbbc043de5938deebfeb360fa71caabc57e2d 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -66,6 +66,8 @@
 #include "content/browser/mime_registry_message_filter.h"
 #include "content/browser/mojo/mojo_application_host.h"
 #include "content/browser/notifications/notification_message_filter.h"
+#include "content/browser/permissions/permission_service_context.h"
+#include "content/browser/permissions/permission_service_impl.h"
 #include "content/browser/profiler_message_filter.h"
 #include "content/browser/push_messaging/push_messaging_message_filter.h"
 #include "content/browser/quota_dispatcher_host.h"
@@ -875,6 +877,12 @@ void RenderProcessHostImpl::CreateMessageFilters() {
 void RenderProcessHostImpl::RegisterMojoServices() {
   mojo_application_host_->service_registry()->AddService(
       base::Bind(&device::BatteryMonitorImpl::Create));
+
+  scoped_ptr<PermissionServiceContext> permission_service_context(
+    new PermissionServiceContext(nullptr));
+  mojo_application_host_->service_registry()->AddService(
+      base::Bind(&PermissionServiceImpl::Create,

[blundell, 2014/11/14 08:31:13]

I think you should delay adding this until you have a consumer of it.

[mlamouri (slow - plz ping), 2014/11/14 11:37:11]

I will use it in a short term future. Push, Geolocation and Notifications are
the three features that will use the Permission service as soon as it is
available and only Geolocation is per-frame only. The others are running in
workers.

+                 base::Passed(&permission_service_context)));
 }
 
 int RenderProcessHostImpl::GetNextRoutingID() {