[Memory-UMA] Add ProcessMap, an Identity to Pid map

services/service_manager/public/cpp/identity.h

Index: services/service_manager/public/cpp/identity.h
diff --git a/services/service_manager/public/cpp/identity.h b/services/service_manager/public/cpp/identity.h
index 7df541e11b2da36efbf5013f7a050547a96f681b..022c4a05576b360a7b5b3ffc9b58738085206080 100644
--- a/services/service_manager/public/cpp/identity.h
+++ b/services/service_manager/public/cpp/identity.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "base/hash.h"
+
 namespace service_manager {
 
 // Represents the identity of an application.
@@ -42,4 +44,16 @@ class Identity {
 
 }  // namespace service_manager
 
+namespace std {
+
+template <>
+struct hash<service_manager::Identity> {
+  std::size_t operator()(const service_manager::Identity& identity) const {
+    return base::Hash(identity.name() + identity.user_id() +
+                      identity.instance());
+  }
+};
+
+}  // namespace std
+
 #endif  // SERVICES_SERVICE_MANAGER_PUBLIC_CPP_IDENTITY_H_