Extend EventFilter to handle the case where EventMatchers from event X get

chrome/common/extensions/event_filtering_info.cc

Index: chrome/common/extensions/event_filtering_info.cc
diff --git a/chrome/common/extensions/event_filtering_info.cc b/chrome/common/extensions/event_filtering_info.cc
index dcf78fc25da4b54cb3899de8664de6bfd0f397a3..1b613991fea7113efdb79c57c9d92f84f489d4a0 100644
--- a/chrome/common/extensions/event_filtering_info.cc
+++ b/chrome/common/extensions/event_filtering_info.cc
@@ -4,6 +4,9 @@
 
 #include "chrome/common/extensions/event_filtering_info.h"
 
+#include "base/values.h"
+#include "base/json/json_writer.h"
+
 namespace extensions {
 
 EventFilteringInfo::EventFilteringInfo()
@@ -18,4 +21,14 @@ void EventFilteringInfo::SetURL(const GURL& url) {
   has_url_ = true;
 }
 
+std::string EventFilteringInfo::AsJSONString() const {
+  std::string result;
+  base::DictionaryValue value;
+  if (has_url_)
+    value.SetString("url", url_.spec());
+
+  base::JSONWriter::Write(&value, &result);
+  return result;
+}
+
 }  // namespace extensions