Refactor context creation parameters into a struct.

ui/gl/gl_context.cc

Index: ui/gl/gl_context.cc
diff --git a/ui/gl/gl_context.cc b/ui/gl/gl_context.cc
index 60e2b399435f973c62e4765515854dd42f51e8a6..609d131f03cdb075b5b293b500abb15afda5acac 100644
--- a/ui/gl/gl_context.cc
+++ b/ui/gl/gl_context.cc
@@ -273,8 +273,8 @@ void GLContextReal::SetCurrent(GLSurface* surface) {
 
 scoped_refptr<GLContext> InitializeGLContext(scoped_refptr<GLContext> context,
                                              GLSurface* compatible_surface,
-                                             GpuPreference gpu_preference) {
-  if (!context->Initialize(compatible_surface, gpu_preference))
+                                             const GLContextAttribs& attribs) {
+  if (!context->Initialize(compatible_surface, attribs))
     return nullptr;
   return context;
 }