Decouple Canvas from DisplayList and map Picture and PictureRecorder more directly to their Skia co…

sky/engine/core/painting/PaintingContext.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/painting/PaintingContext.h"
 
 #include "sky/engine/core/dom/Document.h"
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/painting/PaintingTasks.h"
 #include "sky/engine/platform/geometry/IntRect.h"
 
 namespace blink {
 
 PassRefPtr<PaintingContext> PaintingContext::create(PassRefPtr<Element> element, const FloatSize& size)
 {
     return adoptRef(new PaintingContext(element, size));
 }
 
+// TODO(iansf): Get rid of PaintingContext, which is only relevant to DOM-based
+//              Sky apps, which are now deprecated.  For now, make the compiler
+//              happy by constructing Canvas with a nullptr.
 PaintingContext::PaintingContext(PassRefPtr<Element> element, const FloatSize& size)
-    : Canvas(size)
+    : Canvas(nullptr)
     , m_element(element)
 {
 }
 
 PaintingContext::~PaintingContext()
 {
 }
 
 void PaintingContext::commit()
 {
-    if (!isRecording())
-        return;
-    PaintingTasks::enqueueCommit(m_element, finishRecording());
     m_element->document().scheduleVisualUpdate();
 }
 
 } // namespace blink