Move frame eviction into components

content/browser/renderer_host/renderer_frame_manager.cc

Index: content/browser/renderer_host/renderer_frame_manager.cc
diff --git a/content/browser/renderer_host/renderer_frame_manager.cc b/content/browser/renderer_host/renderer_frame_manager.cc
deleted file mode 100644
index e8944e4371845e723a5236da79f614a15e64b095..0000000000000000000000000000000000000000
--- a/content/browser/renderer_host/renderer_frame_manager.cc
+++ /dev/null
@@ -1,182 +0,0 @@
-// 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/renderer_frame_manager.h"
-
-#include <algorithm>
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/memory/memory_coordinator_client_registry.h"
-#include "base/memory/memory_coordinator_proxy.h"
-#include "base/memory/memory_pressure_listener.h"
-#include "base/memory/memory_pressure_monitor.h"
-#include "base/memory/shared_memory.h"
-#include "base/sys_info.h"
-#include "build/build_config.h"
-#include "components/display_compositor/host_shared_bitmap_manager.h"
-#include "content/public/common/content_features.h"
-
-namespace content {
-namespace {
-
-const int kModeratePressurePercentage = 50;
-const int kCriticalPressurePercentage = 10;
-
-}  // namespace
-
-RendererFrameManager* RendererFrameManager::GetInstance() {
-  return base::Singleton<RendererFrameManager>::get();
-}
-
-void RendererFrameManager::AddFrame(RendererFrameManagerClient* frame,
-                                    bool locked) {
-  RemoveFrame(frame);
-  if (locked)
-    locked_frames_[frame] = 1;
-  else
-    unlocked_frames_.push_front(frame);
-  CullUnlockedFrames(GetMaxNumberOfSavedFrames());
-}
-
-void RendererFrameManager::RemoveFrame(RendererFrameManagerClient* frame) {
-  std::map<RendererFrameManagerClient*, size_t>::iterator locked_iter =
-      locked_frames_.find(frame);
-  if (locked_iter != locked_frames_.end())
-    locked_frames_.erase(locked_iter);
-  unlocked_frames_.remove(frame);
-}
-
-void RendererFrameManager::LockFrame(RendererFrameManagerClient* frame) {
-  std::list<RendererFrameManagerClient*>::iterator unlocked_iter =
-    std::find(unlocked_frames_.begin(), unlocked_frames_.end(), frame);
-  if (unlocked_iter != unlocked_frames_.end()) {
-    DCHECK(locked_frames_.find(frame) == locked_frames_.end());
-    unlocked_frames_.remove(frame);
-    locked_frames_[frame] = 1;
-  } else {
-    DCHECK(locked_frames_.find(frame) != locked_frames_.end());
-    locked_frames_[frame]++;
-  }
-}
-
-void RendererFrameManager::UnlockFrame(RendererFrameManagerClient* frame) {
-  DCHECK(locked_frames_.find(frame) != locked_frames_.end());
-  size_t locked_count = locked_frames_[frame];
-  DCHECK(locked_count);
-  if (locked_count > 1) {
-    locked_frames_[frame]--;
-  } else {
-    RemoveFrame(frame);
-    unlocked_frames_.push_front(frame);
-    CullUnlockedFrames(GetMaxNumberOfSavedFrames());
-  }
-}
-
-size_t RendererFrameManager::GetMaxNumberOfSavedFrames() const {
-  int percentage = 100;
-  if (base::FeatureList::IsEnabled(features::kMemoryCoordinator)) {
-    switch (base::MemoryCoordinatorProxy::GetInstance()->
-            GetCurrentMemoryState()) {
-      case base::MemoryState::NORMAL:
-        percentage = 100;
-        break;
-      case base::MemoryState::THROTTLED:
-        percentage = kCriticalPressurePercentage;
-        break;
-      case base::MemoryState::SUSPENDED:
-      case base::MemoryState::UNKNOWN:
-        NOTREACHED();
-        break;
-    }
-  } else {
-    base::MemoryPressureMonitor* monitor = base::MemoryPressureMonitor::Get();
-
-    if (!monitor)
-      return max_number_of_saved_frames_;
-
-    // Until we have a global OnMemoryPressureChanged event we need to query the
-    // value from our specific pressure monitor.
-    switch (monitor->GetCurrentPressureLevel()) {
-      case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
-        percentage = 100;
-        break;
-      case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
-        percentage = kModeratePressurePercentage;
-        break;
-      case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
-        percentage = kCriticalPressurePercentage;
-        break;
-    }
-  }
-  size_t frames = (max_number_of_saved_frames_ * percentage) / 100;
-  return std::max(static_cast<size_t>(1), frames);
-}
-
-RendererFrameManager::RendererFrameManager()
-  : memory_pressure_listener_(new base::MemoryPressureListener(
-        base::Bind(&RendererFrameManager::OnMemoryPressure,
-                   base::Unretained(this)))) {
-  base::MemoryCoordinatorClientRegistry::GetInstance()->Register(this);
-  max_number_of_saved_frames_ =
-#if defined(OS_ANDROID)
-      // If the amount of memory on the device is >= 3.5 GB, save up to 5
-      // frames.
-      base::SysInfo::AmountOfPhysicalMemoryMB() < 1024 * 3.5f ? 1 : 5;
-#else
-      std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
-#endif
-  max_handles_ = base::SharedMemory::GetHandleLimit() / 8.0f;
-}
-
-RendererFrameManager::~RendererFrameManager() {}
-
-void RendererFrameManager::CullUnlockedFrames(size_t saved_frame_limit) {
-  if (unlocked_frames_.size() + locked_frames_.size() > 0) {
-    float handles_per_frame =
-        display_compositor::HostSharedBitmapManager::current()
-            ->AllocatedBitmapCount() *
-        1.0f / (unlocked_frames_.size() + locked_frames_.size());
-
-    saved_frame_limit = std::max(
-        1,
-        static_cast<int>(std::min(static_cast<float>(saved_frame_limit),
-                                  max_handles_ / handles_per_frame)));
-  }
-  while (!unlocked_frames_.empty() &&
-         unlocked_frames_.size() + locked_frames_.size() > saved_frame_limit) {
-    size_t old_size = unlocked_frames_.size();
-    // Should remove self from list.
-    unlocked_frames_.back()->EvictCurrentFrame();
-    DCHECK_EQ(unlocked_frames_.size() + 1, old_size);
-  }
-}
-
-void RendererFrameManager::OnMemoryPressure(
-    base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
-  switch (memory_pressure_level) {
-    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE:
-      PurgeMemory(kModeratePressurePercentage);
-      break;
-    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL:
-      PurgeMemory(kCriticalPressurePercentage);
-      break;
-    case base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE:
-      // No need to change anything when there is no pressure.
-      return;
-  }
-}
-
-void RendererFrameManager::OnPurgeMemory() {
-  PurgeMemory(kCriticalPressurePercentage);
-}
-
-void RendererFrameManager::PurgeMemory(int percentage) {
-  int saved_frame_limit = max_number_of_saved_frames_;
-  if (saved_frame_limit <= 1)
-    return;
-  CullUnlockedFrames(std::max(1, (saved_frame_limit * percentage) / 100));
-}
-
-}  // namespace content