Use different client interface for WebLayerTreeViewForTesting to decouple from WebLayerTreeViewClie…

webkit/support/webkit_support.h

Index: webkit/support/webkit_support.h
diff --git a/webkit/support/webkit_support.h b/webkit/support/webkit_support.h
index 1f391df625733d3db5c338b97f91361ccff83b11..03b1031b079ff840ef2a9c1fae6aed21a0af51d4 100644
--- a/webkit/support/webkit_support.h
+++ b/webkit/support/webkit_support.h
@@ -134,11 +134,23 @@ WebKit::WebGraphicsContext3D* CreateGraphicsContext3D(
     const WebKit::WebGraphicsContext3D::Attributes& attributes,
     WebKit::WebView* web_view);
 
+class DRTLayerTreeViewClient {
+ public:
+  virtual ~DRTLayerTreeViewClient() { }
+  virtual void Layout() = 0;
+  virtual void ScheduleComposite() = 0;
+};
+
 WebKit::WebLayerTreeView* CreateLayerTreeViewSoftware(
     WebKit::WebLayerTreeViewClient* client);
 WebKit::WebLayerTreeView* CreateLayerTreeView3d(
     WebKit::WebLayerTreeViewClient* client);
 
+WebKit::WebLayerTreeView* CreateLayerTreeViewSoftware(
+    DRTLayerTreeViewClient* client);
+WebKit::WebLayerTreeView* CreateLayerTreeView3d(
+    DRTLayerTreeViewClient* client);
+
 // ------- URL load mocking.
 // Registers the file at |file_path| to be served when |url| is requested.
 // |response| is the response provided with the contents.