Delegating the "are images allowed" decision to renderer.

chrome/common/render_messages.cc

Index: chrome/common/render_messages.cc
diff --git a/chrome/common/render_messages.cc b/chrome/common/render_messages.cc
index 7fd44d492f1b03e91dfc28e3b59f2d130afa929b..0886bf6235cbee7be2d67a690865efa2feee3634 100644
--- a/chrome/common/render_messages.cc
+++ b/chrome/common/render_messages.cc
@@ -26,4 +26,23 @@ void ParamTraits<ContentSettings>::Log(
   l->append("<ContentSettings>");
 }
 
+void ParamTraits<ContentSettingsPattern>::Write(
+    Message* m, const ContentSettingsPattern& pattern) {
+  WriteParam(m, pattern.ToString());
+}
+
+bool ParamTraits<ContentSettingsPattern>::Read(
+    const Message* m, void** iter, ContentSettingsPattern* r) {
+  std::string s;
+  if (!ReadParam(m, iter, &s))
+    return false;
+  *r = ContentSettingsPattern::FromString(s);
+  return true;
+}
+
+void ParamTraits<ContentSettingsPattern>::Log(
+    const ContentSettingsPattern& p, std::string* l) {
+  l->append("<ContentSettingsPattern>");
+}
+
 }  // namespace IPC