Web MIDI: add RequestMIDISysExPermission to BrowserContext

content/shell/shell_browser_context.cc

Index: content/shell/shell_browser_context.cc
diff --git a/content/shell/shell_browser_context.cc b/content/shell/shell_browser_context.cc
index 721d7c88210d7fa46c57022095f01dad747f356d..c2e92e92c9f92831288f8a2ab7e7b549a1f66171 100644
--- a/content/shell/shell_browser_context.cc
+++ b/content/shell/shell_browser_context.cc
@@ -170,6 +170,16 @@ net::URLRequestContextGetter*
   return GetRequestContext();
 }
 
+void ShellBrowserContext::RequestMIDISysExPermission(
+      int render_process_id,
+      int render_view_id,
+      const GURL& requesting_frame,
+      const MIDISysExPermissionCallback& callback) {
+  // Always reject requests for testing.
+  // TODO(toyoshim): Make it programmable to improve test coverage.
+  callback.Run(false);
+}
+
 net::URLRequestContextGetter*
     ShellBrowserContext::CreateRequestContextForStoragePartition(
         const base::FilePath& partition_path,