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

public/web/WebFrame.h

 /*
  * Copyright (C) 2009 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 44 matching lines @@
 namespace blink {
 
 class WebData;
 class WebDataSource;
 class WebDocument;
 class WebElement;
 class WebFormElement;
 class WebFrameClient;
 class WebHistoryItem;
 class WebInputElement;
+class WebLayer;
 class WebPerformance;
 class WebRange;
 class WebSecurityOrigin;
 class WebString;
 class WebURL;
 class WebURLLoader;
 class WebURLRequest;
 class WebView;
 struct WebConsoleMessage;
 struct WebFindOptions;
@@ skipping 73 matching lines @@
     // FIXME: Convert users to embedderIdentifier() and remove identifier().
     long long identifier() const { return embedderIdentifier(); }
     virtual long long embedderIdentifier() const = 0;
 
     // The urls of the given combination types of favicon (if any) specified by
     // the document loaded in this frame. The iconTypesMask is a bit-mask of
     // WebIconURL::Type values, used to select from the available set of icon
     // 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;

[eseidel, 2013/12/11 18:50:01]

I would give this a less generic name.  void setOutOfPRocessWebLayer? 
setRemoteWebLayer?

[kenrb, 2013/12/11 22:44:56]

Done, I used the latter.

+
 
     // Geometry -----------------------------------------------------------
 
     // NOTE: These routines do not force page layout so their results may
     // not be accurate if the page layout is out-of-date.
 
     // If set to false, do not draw scrollbars on this frame's view.
     virtual void setCanHaveScrollbars(bool) = 0;
 
     // The scroll offset from the top-left corner of the frame in pixels.
@@ skipping 496 matching lines @@
     // text form. This is used only by layout tests.
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const = 0;
 
 protected:
     ~WebFrame() { }
 };
 
 } // namespace blink
 
 #endif