fix: ensure widget size is set correctly on linux on small screens (#28757)

When creating a widget on linux the bounds are restricted to the screen
size, when calling SetSize / SetBounds they are not.  This fixes this
initialization issue by calling SetBounds after widget creation.

Noticed this issue while running linux tests on xvfb with a screen size
smaller than the default electron window size (resulted in a failed
test).

Co-authored-by: Samuel Attard <samuel.r.attard@gmail.com>

shell/browser/native_window_views.cc

@@ -311,6 +311,10 @@ NativeWindowViews::NativeWindowViews(const gin_helper::Dictionary& options,
   aura::Window* window = GetNativeWindow();
   if (window)
     window->AddPreTargetHandler(this);
+
+  // On linux after the widget is initialized we might have to force set the
+  // bounds if the bounds are smaller than the current display
+  SetBounds(gfx::Rect(GetPosition(), bounds.size()), false);
 #endif
 }