Refactoring: de-couple Extensions from "script injection System" [render side] : 1

extensions/common/host_id.h

Index: extensions/common/host_id.h
diff --git a/extensions/common/host_id.h b/extensions/common/host_id.h
index 004480704f07766662006c7c3c570883c7e9a296..e30ea0047e1082646b4a1406b1a67dca9dd19649 100644
--- a/extensions/common/host_id.h
+++ b/extensions/common/host_id.h
@@ -7,14 +7,24 @@
 
 #include <string>
 
+#include "base/macros.h"

[Devlin, 2015/02/10 20:59:53]

Cleanup.

[Xi Han, 2015/02/10 23:35:14]

Done.

+
 // IDs of hosts who own user scripts.
 // A HostID is immutable after creation.
 struct HostID {
   enum HostType { EXTENSIONS, WEBUI };
 
+  // The default id of the instance that host will inject the script.
+  // If the instance is a regular tab, the |instance_id| is 0; if the instance
+  // is <webview>, the |instance_id| is a unique number that is bigger than 0.
+  static const int kDefaultInstanceId;
+
   HostID() {}
   HostID(HostType type, const std::string& id)
       : type_(type), id_(id) {}
+  HostID(const HostID& host_id)
+      : type_(host_id.type()),
+        id_(host_id.id()) {}
 
   bool operator<(const HostID& host_id) const {
     if (type_ != host_id.type())
@@ -24,6 +34,10 @@ struct HostID {
     return false;
   }
 
+  bool operator==(const HostID& host_id) const {
+    return type_ == host_id.type() && id_ == host_id.id();
+  }
+
   HostType type() const { return type_; }
   const std::string& id() const { return id_; }