Move GLContext creation from //ui/gl to //ui/gl/init.

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 faf1270cfbee4329e1ef11cdde1990993d1004f5..14da5e346d0406e662f2d5fd7e2346fa15e1804f 100644
--- a/ui/gl/gl_context.cc
+++ b/ui/gl/gl_context.cc
@@ -230,4 +230,13 @@ void GLContextReal::SetCurrent(GLSurface* surface) {
   current_real_context_.Pointer()->Set(surface ? this : nullptr);
 }
 
+scoped_refptr<GLContext> InitializeGLContext(GLContext* raw_context,
+                                             GLSurface* compatible_surface,
+                                             GpuPreference gpu_preference) {
+  scoped_refptr<GLContext> context(raw_context);
+  if (!context->Initialize(compatible_surface, gpu_preference))
+    return nullptr;
+  return context;
+}
+
 }  // namespace gl