Refactoring: de-couple Extensions from "script injection System" [render side]:2

extensions/common/consumer_instance_info.h

Index: extensions/common/consumer_instance_info.h
diff --git a/extensions/common/consumer_instance_info.h b/extensions/common/consumer_instance_info.h
new file mode 100644
index 0000000000000000000000000000000000000000..b4cf466b6d6035bac8737e7b033b1a348c6b5231
--- /dev/null
+++ b/extensions/common/consumer_instance_info.h
@@ -0,0 +1,33 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXTENSIONS_COMMON_CONSUMER_INSTANCE_INFO_H_
+#define EXTENSIONS_COMMON_CONSUMER_INSTANCE_INFO_H_
+
+#include <string>
+
+// Info of API consumer instance that content scripts will be injected on.
+struct ConsumerInstanceInfo {
+  enum InstanceType { TAB, WEBVIEW };
+
+  ConsumerInstanceInfo() {}
+  ConsumerInstanceInfo(InstanceType type, int id)
+      : type_(type),
+        id_(id) {
+  }
+
+  InstanceType type() const { return type_; }
+  int id() const { return id_; }
+
+ private:
+  // The type of the consumer instance.
+  InstanceType type_;
+
+  // The id of the consumer instance.
+  // If the instance is a regular tab, |id_| is 0.
+  // If the instance is a <webview>, |id_| > 0.
+  int id_;
+};
+
+#endif  // EXTENSIONS_COMMON_CONSUMER_INSTANCE_INFO_H_