gl_context_glx: add workaround to create default context

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 7cd676e40f9e4dcd3773fa458a7044dec85decc4..4fbdada69268af99361eb628fc9f300bd6339871 100644
--- a/ui/gl/gl_switches.cc
+++ b/ui/gl/gl_switches.cc
@@ -26,6 +26,10 @@ const char kANGLEImplementationNullName[]     = "null";
 
 namespace switches {
 
+// Ask the GLX driver for the default context instead of trying to get the
+// highest version possible.
+const char kCreateDefaultContext[] = "create-default-context";

[Ken Russell (switch to Gerrit), 2016/11/03 21:30:02]

Please name this something more specific to GL like create-default-gl-context.

[Corentin Wallez, 2016/11/03 21:41:45]

Done

+
 // Disables use of D3D11.
 const char kDisableD3D11[]                  = "disable-d3d11";