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..510b25b73411985772c5e30b77e9c19c13d87155 100644
--- a/content/child/simple_webmimeregistry_impl.cc
+++ b/content/child/simple_webmimeregistry_impl.cc
@@ -35,6 +35,16 @@ WebMimeRegistry::SupportsType SimpleWebMimeRegistryImpl::supportsImageMIMEType(
 }
 
 WebMimeRegistry::SupportsType
+    SimpleWebMimeRegistryImpl::supportsImagePrefixedMIMEType(
+    const WebString& mime_type) {
+    std::string ascii_mime_type = ToASCIIOrEmpty(mime_type);
+  return (net::IsSupportedImageMimeType(ascii_mime_type) ||
+          (StartsWithASCII(ascii_mime_type, "image/", true) &&
+           net::IsSupportedNonImageMimeType(ascii_mime_type))) ?
+      WebMimeRegistry::IsSupported : WebMimeRegistry::IsNotSupported;
+}
+
+WebMimeRegistry::SupportsType
     SimpleWebMimeRegistryImpl::supportsJavaScriptMIMEType(
     const WebString& mime_type) {
   return net::IsSupportedJavascriptMimeType(ToASCIIOrEmpty(mime_type)) ?