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

Source/web/WebFrameImpl.cpp

 /*
  * 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 170 matching lines @@
 #include "platform/network/ResourceRequest.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/SchemeRegistry.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebFileSystem.h"
 #include "public/platform/WebFloatPoint.h"
 #include "public/platform/WebFloatRect.h"
+#include "public/platform/WebLayer.h"
 #include "public/platform/WebPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebSize.h"
 #include "public/platform/WebURLError.h"
 #include "public/platform/WebVector.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/HashMap.h"
 
 using namespace WebCore;
 
@@ skipping 347 matching lines @@
 
 WebVector<WebIconURL> WebFrameImpl::iconURLs(int iconTypesMask) const
 {
     // The URL to the icon may be in the header. As such, only
     // ask the loader for the icon if it's finished loading.
     if (frame()->loader().state() == FrameStateComplete)
         return frame()->document()->iconURLs(iconTypesMask);
     return WebVector<WebIconURL>();
 }
 
+void WebFrameImpl::setWebLayer(WebLayer* webLayer)
+{
+    if (frame()) {

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

early return is generally preferred:
if (!frame()) return;

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

Done.

+        if (frame()->platformLayer())
+            GraphicsLayer::unregisterContentsLayer(frame()->platformLayer());
+        if (webLayer)
+            GraphicsLayer::registerContentsLayer(webLayer);
+        frame()->setPlatformLayer(webLayer);
+        frame()->ownerElement()->setNeedsStyleRecalc(WebCore::SubtreeStyleChange, WebCore::StyleChangeFromRenderer);

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

I don't think you want to be scheduling your own style recalc here.  What are
you trying to do?

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

The goal is to trigger a layout so that the new layer gets picked up and
composited. Is there a better way to do that?

+    }
+}
+
 WebSize WebFrameImpl::scrollOffset() const
 {
     FrameView* view = frameView();
     if (!view)
         return WebSize();
     return view->scrollOffset();
 }
 
 WebSize WebFrameImpl::minimumScrollOffset() const
 {
@@ skipping 1936 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace blink