nixpkgs/pkgs/applications/networking/browsers/chromium/patches/dont-use-ANGLE-by-default.patch

A field trial currently enables the passthrough command decoder, which causes
gl_factory.cc to try kGLImplementationEGLANGLE first, which causes Chromium to fail
to load libGLESv2.so on NixOS.  It somehow does not try kGLImplementationDesktopGL,
and so there is no GL support at all.

Revert to using the validating command decoder, which prevents gl_factory.cc
from touching allowed_impls, allowing it to successfully use kGLImplementationDesktopGL.

diff --git a/ui/gl/gl_utils.cc b/ui/gl/gl_utils.cc
index 697cbed5fe2d..8419bdb21a2f 100644
--- a/ui/gl/gl_utils.cc
+++ b/ui/gl/gl_utils.cc
@@ -71,9 +71,10 @@ bool UsePassthroughCommandDecoder(const base::CommandLine* command_line) {
   } else if (switch_value == kCmdDecoderValidatingName) {
     return false;
   } else {
-    // Unrecognized or missing switch, use the default.
-    return base::FeatureList::IsEnabled(
-        features::kDefaultPassthroughCommandDecoder);
+    // Ignore the field trial that enables it; disable it until
+    // gl_factory.cc kGLImplementationEGLANGLE issues are sorted
+    // out on NixOS.
+    return false;
   }
 }
 }