Make software compositing work on Mac.

content/browser/renderer_host/frame_memory_manager.cc

-// Copyright 2013 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 "content/browser/renderer_host/frame_memory_manager.h"
-
-#include "base/logging.h"
-#include "base/memory/singleton.h"
-#include "base/sys_info.h"
-
-namespace content {
-
-namespace {
-
-size_t MaxNumberOfSavedFrames() {
-  return std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
-}
-
-}  // namespace
-
-FrameMemoryManager* FrameMemoryManager::GetInstance() {
-  return Singleton<FrameMemoryManager>::get();
-}
-
-void FrameMemoryManager::AddFrame(FrameContainer* frame, bool visible) {
-  RemoveFrame(frame);
-  if (visible)
-    visible_frames_.insert(frame);
-  else
-    hidden_frames_.push_front(frame);
-  CullHiddenFrames();
-}
-
-void FrameMemoryManager::RemoveFrame(FrameContainer* frame) {
-  visible_frames_.erase(frame);
-  hidden_frames_.remove(frame);
-}
-
-void FrameMemoryManager::SetFrameVisibility(FrameContainer* frame,
-                                            bool visible) {
-  if (visible) {
-    hidden_frames_.remove(frame);
-    visible_frames_.insert(frame);
-  } else {
-    visible_frames_.erase(frame);
-    hidden_frames_.push_front(frame);
-    CullHiddenFrames();
-  }
-}
-
-FrameMemoryManager::FrameMemoryManager() {}
-
-FrameMemoryManager::~FrameMemoryManager() {}
-
-void FrameMemoryManager::CullHiddenFrames() {
-  while (!hidden_frames_.empty() &&
-         hidden_frames_.size() + visible_frames_.size() >
-             MaxNumberOfSavedFrames()) {
-    size_t old_size = hidden_frames_.size();
-    // Should remove self from list.
-    hidden_frames_.back()->ReleaseCurrentFrame();
-    DCHECK_EQ(hidden_frames_.size() + 1, old_size);
-  }
-}
-
-}  // namespace content