[Downloads] Open media downloads internally

chrome/browser/android/download/download_manager_service.cc

Index: chrome/browser/android/download/download_manager_service.cc
diff --git a/chrome/browser/android/download/download_manager_service.cc b/chrome/browser/android/download/download_manager_service.cc
index 9b4fa66bdb5a2ff43df8e23c803d77032c8c3ba3..5b4fa8aa3910c76e99102e6c2fd8fa9cd92b27fd 100644
--- a/chrome/browser/android/download/download_manager_service.cc
+++ b/chrome/browser/android/download/download_manager_service.cc
@@ -441,3 +441,12 @@ content::DownloadManager* DownloadManagerService::GetDownloadManager(
 
   return manager;
 }
+
+// static
+jboolean IsSupportedMimeType(
+    JNIEnv* env,
+    const JavaParamRef<jclass>& clazz,
+    const JavaParamRef<jstring>& jmime_type) {
+  std::string mime_type = ConvertJavaStringToUTF8(env, jmime_type);
+  return mime_util::IsSupportedMimeType(mime_type);
+}