Attach a WebLayer to a frame element for out-of-process iframes.

public/web/WebFrame.h

Index: public/web/WebFrame.h
diff --git a/public/web/WebFrame.h b/public/web/WebFrame.h
index 97d579948e00ac628fa98d2dd71cf68258e267a8..38c20dd953084884c6ea7a5d461e6a62a42e77a9 100644
--- a/public/web/WebFrame.h
+++ b/public/web/WebFrame.h
@@ -62,6 +62,7 @@ class WebFormElement;
 class WebFrameClient;
 class WebHistoryItem;
 class WebInputElement;
+class WebLayer;
 class WebPerformance;
 class WebRange;
 class WebSecurityOrigin;
@@ -155,6 +156,11 @@ public:
     // URLs
     virtual WebVector<WebIconURL> iconURLs(int iconTypesMask) const = 0;
 
+    // For a WebFrame with contents being rendered in another process, this
+    // sets a layer for use by the in-process compositor. WebLayer should be
+    // null if the content is being rendered in the current process.
+    virtual void setWebLayer(blink::WebLayer*) = 0;
+
 
     // Geometry -----------------------------------------------------------