Allow Windows to use system Vsync if only one window is swapping

ui/gl/gl_surface.cc

Index: ui/gl/gl_surface.cc
diff --git a/ui/gl/gl_surface.cc b/ui/gl/gl_surface.cc
index 620cee7e10ef747d3459571e505cc64310347a76..abc99b188a2a351c37a31c984cd1cd14148c78f4 100644
--- a/ui/gl/gl_surface.cc
+++ b/ui/gl/gl_surface.cc
@@ -265,6 +265,9 @@ bool GLSurface::ExtensionsContain(const char* c_extensions, const char* name) {
   return extensions.find(delimited_name) != std::string::npos;
 }
 
+void GLSurface::SetSwapInterval(int interval) {
+}
+
 GLSurfaceAdapter::GLSurfaceAdapter(GLSurface* surface) : surface_(surface) {}
 
 bool GLSurfaceAdapter::Initialize() {