Refactor context creation parameters into a struct.

ui/gl/gl_context_wgl.cc

Index: ui/gl/gl_context_wgl.cc
diff --git a/ui/gl/gl_context_wgl.cc b/ui/gl/gl_context_wgl.cc
index 51b140b4907bc007216e60e19ed6a4d3d4e2e2f5..6e2f533a2cb7afc2e55c8d1a6a081af76ca1760d 100644
--- a/ui/gl/gl_context_wgl.cc
+++ b/ui/gl/gl_context_wgl.cc
@@ -19,8 +19,8 @@ GLContextWGL::GLContextWGL(GLShareGroup* share_group)
     : GLContextReal(share_group), context_(nullptr) {
 }
 
-bool GLContextWGL::Initialize(
-    GLSurface* compatible_surface, GpuPreference gpu_preference) {
+bool GLContextWGL::Initialize(GLSurface* compatible_surface,
+                              const GLContextAttribs& attribs) {
   // Get the handle of another initialized context in the share group _before_
   // setting context_. Otherwise this context will be considered initialized
   // and could potentially be returned by GetHandle.