fix: app.dock.setIcon() crash before app ready (#36292)

fix: dock.setIcon() crash before app ready

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

shell/browser/browser_mac.mm

@@ -444,6 +444,13 @@
     image = native_image->image();
   }
 
+  // This is needed when this fn is called before the browser
+  // process is ready, since supported scales are normally set
+  // by ui::ResourceBundle::InitSharedInstance
+  // during browser process startup.
+  if (!is_ready())
+    gfx::ImageSkia::SetSupportedScales({1.0f});
+
   [[AtomApplication sharedApplication]
       setApplicationIconImage:image.AsNSImage()];
 }