Enable ANGLE ES3 by default in Chromium (Windows)

ui/gl/gl_switches.cc

Index: ui/gl/gl_switches.cc
diff --git a/ui/gl/gl_switches.cc b/ui/gl/gl_switches.cc
index 3116b7b45254d26e6275aa87992eb48b5f6455c2..71f28a73729be50ebd089bf8f6fe5c49ac55dd99 100644
--- a/ui/gl/gl_switches.cc
+++ b/ui/gl/gl_switches.cc
@@ -28,6 +28,9 @@ namespace switches {
 // Disables use of D3D11.
 const char kDisableD3D11[]                  = "disable-d3d11";
 
+// Disables use of ES3 backend (use ES2 backend instead).
+const char kDisableES3GLContext[]           = "disable-es3-gl-context";
+
 // Stop the GPU from synchronizing on the vsync before presenting.
 // We can select from the options below:
 //  beginframe: Next frame can start without any delay on cc::scheduler in