Refactor context creation parameters into a struct.

ui/gl/gl_context_glx.cc

Index: ui/gl/gl_context_glx.cc
diff --git a/ui/gl/gl_context_glx.cc b/ui/gl/gl_context_glx.cc
index ab81f5431f5240433ccd5aeca38e0db27cd86266..373e53173d09f77073bb9174d7f944e6fec4a683 100644
--- a/ui/gl/gl_context_glx.cc
+++ b/ui/gl/gl_context_glx.cc
@@ -159,8 +159,8 @@ XDisplay* GLContextGLX::display() {
   return display_;
 }
 
-bool GLContextGLX::Initialize(
-    GLSurface* compatible_surface, GpuPreference gpu_preference) {
+bool GLContextGLX::Initialize(GLSurface* compatible_surface,
+                              const GLContextAttribs& attribs) {
   display_ = static_cast<XDisplay*>(compatible_surface->GetDisplay());
 
   GLXContext share_handle = static_cast<GLXContext>(