Warn user in case extension delays network traffic too much.

chrome/browser/extensions/extension_webrequest_api.h

Index: chrome/browser/extensions/extension_webrequest_api.h
diff --git a/chrome/browser/extensions/extension_webrequest_api.h b/chrome/browser/extensions/extension_webrequest_api.h
index 268a4c27c89446cd13926371abfe20c3af902cc6..cf2f411d900f6d7d19d171876b72c1b293713c66 100644
--- a/chrome/browser/extensions/extension_webrequest_api.h
+++ b/chrome/browser/extensions/extension_webrequest_api.h
@@ -14,6 +14,7 @@
 #include "base/memory/singleton.h"
 #include "base/time.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/extensions/extension_webrequest_time_tracker.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/url_pattern_set.h"
 #include "ipc/ipc_message.h"
@@ -22,7 +23,6 @@
 #include "webkit/glue/resource_type.h"
 
 class ExtensionInfoMap;
-class ExtensionWebRequestTimeTracker;
 class GURL;
 
 namespace base {
@@ -42,7 +42,8 @@ class URLRequest;
 // This class observes network events and routes them to the appropriate
 // extensions listening to those events. All methods must be called on the IO
 // thread unless otherwise specified.
-class ExtensionWebRequestEventRouter {
+class ExtensionWebRequestEventRouter
+    : public ExtensionWebRequestTimeTrackerDelegate {
  public:
   enum EventTypes {
     kInvalidEvent = 0,
@@ -271,7 +272,7 @@ class ExtensionWebRequestEventRouter {
   typedef std::map<void*, void*> CrossProfileMap;
 
   ExtensionWebRequestEventRouter();
-  ~ExtensionWebRequestEventRouter();
+  virtual ~ExtensionWebRequestEventRouter();
 
   bool DispatchEvent(
       void* profile,
@@ -347,6 +348,18 @@ class ExtensionWebRequestEventRouter {
       BlockedRequest* request,
       std::list<std::string>* conflicting_extensions) const;
 
+  // Implementation for ExtensionWebRequestTimeTrackerDelegate:
+  virtual void NotifyExcessiveDelays(
+      void* profile,
+      size_t num_delayed_messages,
+      size_t total_num_messages,
+      const std::set<std::string>& extension_ids) OVERRIDE;
+  virtual void NotifyModerateDelays(
+      void* profile,
+      size_t num_delayed_messages,
+      size_t total_num_messages,
+      const std::set<std::string>& extension_ids) OVERRIDE;
+
   // A map for each profile that maps an event name to a set of extensions that
   // are listening to that event.
   ListenerMap listeners_;