Add mash shelf application id support.

content/common/mojo/mojo_shell_connection_impl.cc

Index: content/common/mojo/mojo_shell_connection_impl.cc
diff --git a/content/common/mojo/mojo_shell_connection_impl.cc b/content/common/mojo/mojo_shell_connection_impl.cc
index 1bfc243e3a5c5f1dd0a4142ae2c7002c2bd516ff..8f7f735afeb855140191147fac80662be19166dd 100644
--- a/content/common/mojo/mojo_shell_connection_impl.cc
+++ b/content/common/mojo/mojo_shell_connection_impl.cc
@@ -130,6 +130,11 @@ shell::Connector* MojoShellConnectionImpl::GetConnector() {
   return shell_connection_->connector();
 }
 
+const shell::Identity& MojoShellConnectionImpl::GetIdentity() const {
+  DCHECK(shell_connection_);
+  return shell_connection_->identity();
+}
+
 bool MojoShellConnectionImpl::UsingExternalShell() const {
   return external_;
 }