mojo: Add DataURLFetcher for processing data: urls.

mojo/fetcher/base_application_fetcher.cc

Index: mojo/fetcher/base_application_fetcher.cc
diff --git a/mojo/fetcher/base_application_fetcher.cc b/mojo/fetcher/base_application_fetcher.cc
index 68909b578f94a67efe93c62cdafe9223e8b28895..b6b5730c7587b61ab52b011c21fc50e7d9adfe8a 100644
--- a/mojo/fetcher/base_application_fetcher.cc
+++ b/mojo/fetcher/base_application_fetcher.cc
@@ -5,6 +5,7 @@
 #include "mojo/fetcher/base_application_fetcher.h"
 
 #include "mojo/fetcher/about_fetcher.h"
+#include "mojo/fetcher/data_fetcher.h"
 #include "mojo/fetcher/local_fetcher.h"
 #include "mojo/fetcher/network_fetcher.h"
 #include "mojo/fetcher/switches.h"
@@ -50,6 +51,11 @@ void BaseApplicationFetcher::FetchRequest(
     return;
   }
 
+  if (url.SchemeIs(url::kDataScheme)) {
+    DataFetcher::Start(url, loader_callback);
+    return;
+  }
+
   GURL resolved_url = ResolveURL(url);
 
   if (resolved_url.SchemeIsFile()) {