fix-touchpad-lagging-issue.patch

Fix touchpad lagging issue. port from crrev.com/c/867070
---

diff --git a/gpu/ipc/in_process_command_buffer.cc b/gpu/ipc/in_process_command_buffer.cc
index ec3464e2a55d..bd307fc653ad 100644
--- a/gpu/ipc/in_process_command_buffer.cc
+++ b/gpu/ipc/in_process_command_buffer.cc
@@ -991,6 +991,8 @@ void InProcessCommandBuffer::DidCreateAcceleratedSurfaceChildWindow(
     SurfaceHandle parent_window,
     SurfaceHandle child_window) {
   ::SetParent(child_window, parent_window);
+  ::SetWindowPos(child_window, HWND_BOTTOM, 0, 0, 0, 0,
+                 SWP_NOMOVE | SWP_NOSIZE);
 }
 #endif
 
diff --git a/ui/gfx/win/rendering_window_manager.cc b/ui/gfx/win/rendering_window_manager.cc
index a0528ecf9ab7..72ef021bedbe 100644
--- a/ui/gfx/win/rendering_window_manager.cc
+++ b/ui/gfx/win/rendering_window_manager.cc
@@ -49,6 +49,7 @@ void RenderingWindowManager::DoSetParentOnChild(HWND parent) {
   }
 
   ::SetParent(child, parent);
+  ::SetWindowPos(child, HWND_BOTTOM, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);
 }
 
 void RenderingWindowManager::UnregisterParent(HWND parent) {