Add support for omnibox.onInputStarted and onInputCancelled.

chrome/browser/extensions/extension_message_service.h

Index: chrome/browser/extensions/extension_message_service.h
diff --git a/chrome/browser/extensions/extension_message_service.h b/chrome/browser/extensions/extension_message_service.h
index bf499482f8d7f6a63020e21d8ea871887d17558b..fa8978660e0f7bbdfa8d72a5fd7ea94d540f1069 100644
--- a/chrome/browser/extensions/extension_message_service.h
+++ b/chrome/browser/extensions/extension_message_service.h
@@ -62,6 +62,10 @@ class ExtensionMessageService
   struct MessageChannel;
   struct MessagePort;
 
+  // Returns the event name for an event that is extension-specific.
+  static std::string GetPerExtensionEventName(const std::string& event_name,
+                                              const std::string& extension_id);
+
   // --- UI thread only:
 
   explicit ExtensionMessageService(Profile* profile);
@@ -92,6 +96,13 @@ class ExtensionMessageService
       const std::string& event_name, const std::string& event_args,
       bool has_incognito_data, const GURL& event_url);
 
+  // Same as above, except use the extension-specific naming scheme for the
+  // event. This is used by events that are per-extension.
+  void DispatchEventToExtension(
+      const std::string& extension_id,
+      const std::string& event_name, const std::string& event_args,
+      bool has_incognito_data, const GURL& event_url);
+
   // Given an extension ID, opens a channel between the given
   // automation "port" or DevTools service and that extension. the
   // channel will be open to the extension process hosting the