Prevent display going to sleep while taking a screenshot

content/browser/renderer_host/render_widget_host_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 69 matching lines @@
 class RenderWidgetHostDelegate;
 class RenderWidgetHostOwnerDelegate;
 class SyntheticGestureController;
 class TimeoutMonitor;
 class TouchEmulator;
 class WebCursor;
 struct EditCommand;
 struct ResizeParams;
 struct TextInputState;
 
+#if defined(OS_MACOSX)
+class PowerSaveBlockerImpl;
+#endif
+
 // This implements the RenderWidgetHost interface that is exposed to
 // embedders of content, and adds things only visible to content.
 class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
                                             public InputRouterClient,
                                             public InputAckHandler,
                                             public TouchEmulatorClient,
                                             public IPC::Listener {
  public:
   // |routing_id| must not be MSG_ROUTING_NONE.
   // If this object outlives |delegate|, DetachDelegate() must be called when
@@ skipping 702 matching lines @@
   // causing HasFocus to return false when is_focused_ is true.
   bool is_focused_;
 
   // This value indicates how long to wait before we consider a renderer hung.
   base::TimeDelta hung_renderer_delay_;
 
   // This value indicates how long to wait for a new compositor frame from a
   // renderer process before clearing any previously displayed content.
   base::TimeDelta new_content_rendering_delay_;
 
+#if defined(OS_MACOSX)
+  std::unique_ptr<PowerSaveBlockerImpl> power_save_blocker_;
+#endif
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_