Move RenderLayerCompositor trigger caching to be when settings change

Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 522 matching lines @@
     // Consolidate some common code between starting a drag over a target and
     // updating a drag over a target. If we're starting a drag, |isEntering|
     // should be true.
     WebDragOperation dragTargetDragEnterOrOver(const WebPoint& clientPoint,
                                                const WebPoint& screenPoint,
                                                DragAction,
                                                int keyModifiers);
 
     void configureAutoResizeMode();
 
+    void setCompositorCreationFailed(bool);
     void setIsAcceleratedCompositingActive(bool);
     void doComposite();
     void doPixelReadbackToCanvas(WebCanvas*, const WebCore::IntRect&);
     void reallocateRenderer();
     void updateLayerTreeViewport();
     void updateLayerTreeBackgroundColor();
     void updateRootLayerTransform();
     void updateLayerTreeDeviceScaleFactor();
 
     // Helper function: Widens the width of |source| by the specified margins
@@ skipping 174 matching lines @@
     float m_zoomFactorOverride;
 };
 
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif