Mac: Recreate browser-side GL contexts on GPU switch

content/browser/renderer_host/render_widget_host_view_mac.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_VIEW_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <list>
 #include <map>
@@ skipping 528 matching lines @@
 
   // Shuts down the render_widget_host_.  This is a separate function so we can
   // invoke it from the message loop.
   void ShutdownHost();
 
   void EnsureSoftwareLayer();
   void DestroySoftwareLayer();
 
   bool EnsureCompositedIOSurface() WARN_UNUSED_RESULT;
   void EnsureCompositedIOSurfaceLayer();
+  enum DestroyCompositedIOSurfaceLayerBehavior {
+    kLeaveLayerInHierarchy,
+    kRemoveLayerFromHierarchy,
+  };
+  void DestroyCompositedIOSurfaceLayer(
+      DestroyCompositedIOSurfaceLayerBehavior destroy_layer_behavior);
   enum DestroyContextBehavior {
     kLeaveContextBoundToView,
     kDestroyContext,
   };
-  void DestroyCompositedIOSurfaceLayer();
-  void DestroyCompositedIOSurfaceAndLayer(DestroyContextBehavior
-      destroy_context_behavior);
+  void DestroyCompositedIOSurfaceAndLayer(
+      DestroyContextBehavior destroy_context_behavior);
 
   void DestroyCompositingStateOnError();
 
   // Unbind the GL context (if any) that is bound to |cocoa_view_|.
   void ClearBoundContextDrawable();
 
   // Called when a GPU SwapBuffers is received.
   void GotAcceleratedFrame();
 
   // Called when a software DIB is received.
@@ skipping 74 matching lines @@
   scoped_ptr<RenderWidgetHostViewFrameSubscriber> frame_subscriber_;
 
   base::WeakPtrFactory<RenderWidgetHostViewMac>
       software_frame_weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_