Plumb SetVisible from ui::Compositor to the DirectRenderer.

ui/compositor/compositor.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 UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 122 matching lines @@
 
   // Gets the task graph runner.
   virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
 
   // Allocate a new client ID for the display compositor.
   virtual uint32_t AllocateSurfaceClientId() = 0;
 
   // Gets the surface manager.
   virtual cc::SurfaceManager* GetSurfaceManager() = 0;
 
+  // Inform the display corresponding to this compositor if it is visible. When
+  // false it does not need to produce any frames. Visibility is reset for each
+  // call to CreateOutputSurface.
+  virtual void SetDisplayVisible(ui::Compositor* compositor, bool visible) = 0;
+
   // Resize the display corresponding to this compositor to a particular size.
   virtual void ResizeDisplay(ui::Compositor* compositor,
                              const gfx::Size& size) = 0;
 
   // Set the output color profile into which this compositor should render.
   virtual void SetDisplayColorSpace(ui::Compositor* compositor,
                                     const gfx::ColorSpace& color_space) = 0;
 
   virtual void SetAuthoritativeVSyncInterval(ui::Compositor* compositor,
                                              base::TimeDelta interval) = 0;
@@ skipping 271 matching lines @@
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_