ui: Prefer +/- operators to apply offsets.

ui/gl/gl_surface.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_surface.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 129 matching lines @@
 void* GLSurface::GetConfig() {
   NOTIMPLEMENTED();
   return NULL;
 }
 
 unsigned GLSurface::GetFormat() {
   NOTIMPLEMENTED();
   return 0;
 }
 
-bool GLSurface::GetVSyncParameters(base::TimeTicks* timebase,
-                                   base::TimeDelta* interval) {
-  return false;
+void GLSurface::GetVSyncParameters(const UpdateVSyncCallback& callback) {
 }
 
 GLSurface* GLSurface::GetCurrent() {
   return current_surface_.Pointer()->Get();
 }
 
 GLSurface::~GLSurface() {
   if (GetCurrent() == this)
     SetCurrent(NULL);
 }
@@ skipping 86 matching lines @@
 }
 
 void* GLSurfaceAdapter::GetConfig() {
   return surface_->GetConfig();
 }
 
 unsigned GLSurfaceAdapter::GetFormat() {
   return surface_->GetFormat();
 }
 
-bool GLSurfaceAdapter::GetVSyncParameters(base::TimeTicks* timebase,
-                                          base::TimeDelta* interval) {
-  return surface_->GetVSyncParameters(timebase, interval);
+void GLSurfaceAdapter::GetVSyncParameters(const UpdateVSyncCallback& callback) {
+  surface_->GetVSyncParameters(callback);
 }
 
 GLSurfaceAdapter::~GLSurfaceAdapter() {}
 
 }  // namespace gfx