Ok, here is a different approach at this change.

chrome/common/child_process_logging.h

Index: chrome/common/child_process_logging.h
diff --git a/chrome/common/child_process_logging.h b/chrome/common/child_process_logging.h
index aa336af1870f904cf6705a2d085bf9a04cc4b393..513359f25ea2c83ab77a358298b48822025bb399 100644
--- a/chrome/common/child_process_logging.h
+++ b/chrome/common/child_process_logging.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_COMMON_CHILD_PROCESS_LOGGING_H_
 #define CHROME_COMMON_CHILD_PROCESS_LOGGING_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "googleurl/src/gurl.h"
 
@@ -17,6 +19,14 @@ void SetActiveURL(const GURL& url);
 // Sets the Client ID that is used as GUID if a Chrome process crashes.
 void SetClientId(const std::string& client_id);
 
+// Sets the list of "active" extensions in this process. We overload "active" to
+// mean different things depending on the process type:
+// - browser: all enabled extensions
+// - renderer: the unique set of extension ids from all content scripts
+// - extension: the id of each extension running in this process (there can be
+//   multiple because of process collapsing).
+void SetActiveExtensions(const std::vector<std::string>& extension_ids);
+
 // Simple wrapper class that sets the active URL in it's constructor and clears
 // the active URL in the destructor.
 class ScopedActiveURLSetter {