Adds a way to determine id of content handler that created app

content/browser/mojo/mojo_app_connection_impl.cc

Index: content/browser/mojo/mojo_app_connection_impl.cc
diff --git a/content/browser/mojo/mojo_app_connection_impl.cc b/content/browser/mojo/mojo_app_connection_impl.cc
index 06d07c562e7b8017f4217f86a912f40340324120..ca8d5a5f82415c35a3be734dc78bd235050d8e31 100644
--- a/content/browser/mojo/mojo_app_connection_impl.cc
+++ b/content/browser/mojo/mojo_app_connection_impl.cc
@@ -4,6 +4,7 @@
 
 #include "content/browser/mojo/mojo_app_connection_impl.h"
 
+#include "base/bind.h"
 #include "content/browser/mojo/mojo_shell_context.h"
 #include "mojo/shell/capability_filter.h"
 
@@ -11,6 +12,10 @@ namespace content {
 
 const char kBrowserMojoAppUrl[] = "system:content_browser";
 
+namespace {
+void OnGotContentHandlerID(uint32_t content_handler_id) {}
+}  // namespace
+
 // static
 scoped_ptr<MojoAppConnection> MojoAppConnection::Create(
     const GURL& url,
@@ -23,7 +28,8 @@ MojoAppConnectionImpl::MojoAppConnectionImpl(const GURL& url,
                                              const GURL& requestor_url) {
   MojoShellContext::ConnectToApplication(
       url, requestor_url, mojo::GetProxy(&services_),
-      mojo::ServiceProviderPtr(), mojo::shell::GetPermissiveCapabilityFilter());
+      mojo::ServiceProviderPtr(), mojo::shell::GetPermissiveCapabilityFilter(),
+      base::Bind(&OnGotContentHandlerID));
 }
 
 MojoAppConnectionImpl::~MojoAppConnectionImpl() {