Bug 1690247 - Enable the batched texture upload path on windows. r=jrmuizel

Differential Revision: https://phabricator.services.mozilla.com/D104044

modules/libpref/init/all.js

@@ -654,8 +654,17 @@ pref("gfx.webrender.debug.obscure-images", false);
 pref("gfx.webrender.debug.glyph-flashing", false);
 pref("gfx.webrender.debug.capture-profiler", false);
 pref("gfx.webrender.debug.profiler-ui", "Default");
+
+// Temporarily use the debug pref to configure the upload startegy on windows.
+// If this doesn't cause breakage it will be selected directly in WebRender's
+// initialization code.
+#ifdef XP_WIN
+pref("gfx.webrender.debug.batched-texture-uploads", true);
+pref("gfx.webrender.debug.draw-calls-for-texture-copy", true);
+#else
 pref("gfx.webrender.debug.batched-texture-uploads", false);
 pref("gfx.webrender.debug.draw-calls-for-texture-copy", false);
+#endif
 
 
 pref("accessibility.warn_on_browsewithcaret", true);