Block renderer-initiated main frame navigations to data URLs

third_party/WebKit/Source/platform/network/NetworkUtils.cpp

Index: third_party/WebKit/Source/platform/network/NetworkUtils.cpp
diff --git a/third_party/WebKit/Source/platform/network/NetworkUtils.cpp b/third_party/WebKit/Source/platform/network/NetworkUtils.cpp
index ec49e5c3d93895bd2ef91c63c55c8e3093611b31..c0721f5078af5f9a0485b7fa88775bb88cb4259b 100644
--- a/third_party/WebKit/Source/platform/network/NetworkUtils.cpp
+++ b/third_party/WebKit/Source/platform/network/NetworkUtils.cpp
@@ -78,6 +78,19 @@ PassRefPtr<SharedBuffer> parseDataURL(const KURL& url,
   return nullptr;
 }
 
+PLATFORM_EXPORT bool getDataURLMimeType(const KURL& url,
+                                        AtomicString& mimetype,
+                                        bool* isSupportedMimeType) {
+  std::string utf8MimeType;
+  std::string utf8Charset;
+  if (net::DataURL::Parse(WebStringToGURL(url.getString()), &utf8MimeType,
+                          &utf8Charset, nullptr)) {
+    *isSupportedMimeType = mime_util::IsSupportedMimeType(utf8MimeType);
+    return true;
+  }
+  return false;
+}
+
 bool isRedirectResponseCode(int responseCode) {
   return net::HttpResponseHeaders::IsRedirectResponseCode(responseCode);
 }