PlzNavigate: preserve SourceLocation when navigating

third_party/WebKit/public/web/WebSourceLocation.h

Index: third_party/WebKit/public/web/WebSourceLocation.h
diff --git a/third_party/WebKit/public/web/WebSourceLocation.h b/third_party/WebKit/public/web/WebSourceLocation.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb3bf978e14533e37a012213300c85aec7093c50
--- /dev/null
+++ b/third_party/WebKit/public/web/WebSourceLocation.h
@@ -0,0 +1,23 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebSourceLocation_h
+#define WebSourceLocation_h
+
+#include "third_party/WebKit/public/platform/WebString.h"
+
+namespace blink {
+
+// PlzNavigate
+// This struct is passed to the browser when navigating, so that console error
+// messages due to the navigation do not lose the source location information.
+struct WebSourceLocation {
+  WebString url;
+  unsigned lineNumber = 0;
+  unsigned columnNumber = 0;
+};
+
+}  // namespace blink
+
+#endif