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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/renderer/render_process_visibility_manager.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/memory/memory_pressure_listener.h"
      9 
     10 namespace content {
     11 
     12 RenderProcessVisibilityManager::RenderProcessVisibilityManager()
     13     : num_visible_render_widgets_(0) {
     14 }
     15 
     16 RenderProcessVisibilityManager::~RenderProcessVisibilityManager() {
     17 }
     18 
     19 // static
     20 RenderProcessVisibilityManager* RenderProcessVisibilityManager::GetInstance() {
     21   return Singleton<RenderProcessVisibilityManager>::get();
     22 }
     23 
     24 void RenderProcessVisibilityManager::WidgetVisibilityChanged(bool visible) {
     25 #if !defined(SYSTEM_NATIVELY_SIGNALS_MEMORY_PRESSURE)
     26   num_visible_render_widgets_ += visible ? 1 : -1;
     27   DCHECK_LE(0, num_visible_render_widgets_);
     28   if (num_visible_render_widgets_ == 0) {
     29     // TODO(vollick): Remove this this heavy-handed approach once we're polling
     30     // the real system memory pressure.
     31     base::MemoryPressureListener::NotifyMemoryPressure(
     32         base::MemoryPressureListener::MEMORY_PRESSURE_MODERATE);
     33   }
     34 #endif
     35 }
     36 
     37 }  // namespace content
     38