Added a method to detect all supported "image/*" MIME types

content/child/simple_webmimeregistry_impl.cc

Index: content/child/simple_webmimeregistry_impl.cc
diff --git a/content/child/simple_webmimeregistry_impl.cc b/content/child/simple_webmimeregistry_impl.cc
index e7416d92041d5443c2cd4782704a549fa4fbb99e..aded9238c4abbab4c10480175986a82bfd61ca40 100644
--- a/content/child/simple_webmimeregistry_impl.cc
+++ b/content/child/simple_webmimeregistry_impl.cc
@@ -35,6 +35,13 @@ WebMimeRegistry::SupportsType SimpleWebMimeRegistryImpl::supportsImageMIMEType(
 }
 
 WebMimeRegistry::SupportsType
+    SimpleWebMimeRegistryImpl::supportsImagePrefixedMIMEType(
+    const WebString& mime_type) {
+  return net::IsSupportedImagePrefixedMimeType(ToASCIIOrEmpty(mime_type)) ?
+      WebMimeRegistry::IsSupported : WebMimeRegistry::IsNotSupported;
+}
+
+WebMimeRegistry::SupportsType
     SimpleWebMimeRegistryImpl::supportsJavaScriptMIMEType(
     const WebString& mime_type) {
   return net::IsSupportedJavascriptMimeType(ToASCIIOrEmpty(mime_type)) ?