fix: use tiled edges to calculate frame inset sizes in Linux (#39567)

Adapt to the window frame size calculation changes in CL 3970920 by
setting the inset sizes to 0 for tiled edges.

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Athul Iddya <athul@iddya.com>

shell/browser/ui/views/client_frame_view_linux.cc

@@ -150,7 +150,13 @@ void ClientFrameViewLinux::Init(NativeWindowViews* window,
 }
 
 gfx::Insets ClientFrameViewLinux::GetBorderDecorationInsets() const {
-  return frame_provider_->GetFrameThicknessDip();
+  const auto insets = frame_provider_->GetFrameThicknessDip();
+  // We shouldn't draw frame decorations for the tiled edges.
+  // See https://wayland.app/protocols/xdg-shell#xdg_toplevel:enum:state
+  return gfx::Insets::TLBR(tiled_edges().top ? 0 : insets.top(),
+                           tiled_edges().left ? 0 : insets.left(),
+                           tiled_edges().bottom ? 0 : insets.bottom(),
+                           tiled_edges().right ? 0 : insets.right());
 }
 
 gfx::Insets ClientFrameViewLinux::GetInputInsets() const {