Early terminate flings when scrolling impossible

content/common/input/did_overscroll_params.h

Index: content/common/input/did_overscroll_params.h
diff --git a/content/common/input/did_overscroll_params.h b/content/common/input/did_overscroll_params.h
new file mode 100644
index 0000000000000000000000000000000000000000..4f6a7f1f22694e0ea586c9c719fe0149a2f7f2e4
--- /dev/null
+++ b/content/common/input/did_overscroll_params.h
@@ -0,0 +1,20 @@
+// Copyright 2014 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 CONTENT_COMMON_INPUT_DID_OVERSCROLL_PARAMS_H_
+#define CONTENT_COMMON_INPUT_DID_OVERSCROLL_PARAMS_H_
+
+#include "ui/gfx/geometry/vector2d_f.h"
+
+namespace content {
+
+struct DidOverscrollParams {
+  gfx::Vector2dF accumulated_overscroll;
+  gfx::Vector2dF latest_overscroll_delta;
+  gfx::Vector2dF current_fling_velocity;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_INPUT_DID_OVERSCROLL_PARAMS_H_