1 files changed, 20 insertions, 0 deletions
diff --git a/Source/WebKit2/WebProcess/WebPage/LayerTreeHost.h b/Source/WebKit2/WebProcess/WebPage/LayerTreeHost.h
index bbb94e8..004bdb7 100644
--- a/Source/WebKit2/WebProcess/WebPage/LayerTreeHost.h
+++ b/Source/WebKit2/WebProcess/WebPage/LayerTreeHost.h
@@ -38,6 +38,7 @@ namespace WebCore {
 namespace WebKit {
 
 class LayerTreeContext;
+class UpdateInfo;
 class WebPage;
 
 class LayerTreeHost : public RefCounted<LayerTreeHost> {
@@ -45,6 +46,8 @@ public:
     static PassRefPtr<LayerTreeHost> create(WebPage*);
     virtual ~LayerTreeHost();
 
+    static bool supportsAcceleratedCompositing();
+
     virtual const LayerTreeContext& layerTreeContext() = 0;
     virtual void scheduleLayerFlush() = 0;
     virtual void setShouldNotifyAfterNextScheduledLayerFlush(bool) = 0;
@@ -60,12 +63,29 @@ public:
     virtual void didUninstallPageOverlay() = 0;
     virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&) = 0;
 
+    virtual void pauseRendering() { }
+    virtual void resumeRendering() { }
+
+    // If a derived class overrides this function to return true, the derived class must also
+    // override the functions beneath it.
+    virtual bool participatesInDisplay() { return false; }
+    virtual bool needsDisplay() { ASSERT_NOT_REACHED(); return false; }
+    virtual double timeUntilNextDisplay() { ASSERT_NOT_REACHED(); return 0; }
+    virtual void display(UpdateInfo&) { ASSERT_NOT_REACHED(); }
+
 protected:
     explicit LayerTreeHost(WebPage*);
 
     WebPage* m_webPage;
 };
 
+#if !PLATFORM(WIN)
+inline bool LayerTreeHost::supportsAcceleratedCompositing()
+{
+    return true;
+}
+#endif
+
 } // namespace WebKit
 
 #endif // LayerTreeHost_h