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

chrome/common/extensions/event_matcher.cc

Index: chrome/common/extensions/event_matcher.cc
diff --git a/chrome/common/extensions/event_matcher.cc b/chrome/common/extensions/event_matcher.cc
index 1f9e47481c9baac0e2c046fbdd3bd06df53ed6fa..8a64f787fea5b92699273414a5612821924c074d 100644
--- a/chrome/common/extensions/event_matcher.cc
+++ b/chrome/common/extensions/event_matcher.cc
@@ -5,9 +5,14 @@
 #include "chrome/common/extensions/event_matcher.h"
 #include "chrome/common/extensions/event_filtering_info.h"
 
+namespace {
+const char kUrlFiltersKey[] = "url";
+}
+
 namespace extensions {
 
-EventMatcher::EventMatcher() {
+EventMatcher::EventMatcher(scoped_ptr<base::DictionaryValue> filter)
+    : filter_(filter.Pass()) {
 }
 
 EventMatcher::~EventMatcher() {
@@ -19,4 +24,23 @@ bool EventMatcher::MatchNonURLCriteria(
   return true;
 }
 
+int EventMatcher::GetURLFilterCount() const {
+  base::ListValue* url_filters = NULL;
+  if (filter_->GetList(kUrlFiltersKey, &url_filters))
+    return url_filters->GetSize();
+  return 0;
+}
+
+bool EventMatcher::GetURLFilter(int i, base::DictionaryValue** url_filter_out) {
+  base::ListValue* url_filters = NULL;
+  if (filter_->GetList(kUrlFiltersKey, &url_filters)) {
+    return url_filters->GetDictionary(i, url_filter_out);
+  }
+  return false;
+}
+
+int EventMatcher::HasURLFilters() const {
+  return GetURLFilterCount() != 0;
+}
+
 }  // namespace extensions