gl_context_glx: add workaround to create default context

ui/gl/gl_context_glx.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_context_glx.h"
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 #include <memory>
 
+#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/GL/glextchromium.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_glx.h"
 
 namespace gl {
 
@@ skipping 139 matching lines @@
 
 bool GLContextGLX::Initialize(
     GLSurface* compatible_surface, GpuPreference gpu_preference) {
   display_ = static_cast<XDisplay*>(compatible_surface->GetDisplay());
 
   GLXContext share_handle = static_cast<GLXContext>(
       share_group() ? share_group()->GetHandle() : nullptr);
 
   if (GLSurfaceGLX::IsCreateContextSupported()) {
     DVLOG(1) << "GLX_ARB_create_context supported.";
-    context_ = CreateHighestVersionContext(
-        display_, static_cast<GLXFBConfig>(compatible_surface->GetConfig()),
-        share_handle);
+    if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+            switches::kCreateDefaultGLContext)) {
+      context_ = CreateContextAttribs(
+          display_, static_cast<GLXFBConfig>(compatible_surface->GetConfig()),
+          share_handle, GLVersion(0, 0), 0);
+    } else {
+      context_ = CreateHighestVersionContext(
+          display_, static_cast<GLXFBConfig>(compatible_surface->GetConfig()),
+          share_handle);
+    }
     if (!context_) {
       LOG(ERROR) << "Failed to create GL context with "
                  << "glXCreateContextAttribsARB.";
       return false;
     }
   } else {
     DVLOG(1) << "GLX_ARB_create_context not supported.";
     context_ = glXCreateNewContext(
        display_,
        static_cast<GLXFBConfig>(compatible_surface->GetConfig()),
@@ skipping 128 matching lines @@
 
 bool GLContextGLX::WasAllocatedUsingRobustnessExtension() {
   return GLSurfaceGLX::IsCreateContextRobustnessSupported();
 }
 
 GLContextGLX::~GLContextGLX() {
   Destroy();
 }
 
 }  // namespace gl