Remove CanvasRenderingContext from the web exposed objects

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 117 matching lines @@
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/html/HTMLMetaElement.h"
 #include "core/html/HTMLNameCollection.h"
 #include "core/html/HTMLScriptElement.h"
 #include "core/html/HTMLStyleElement.h"
 #include "core/html/HTMLTemplateElement.h"
 #include "core/html/HTMLTitleElement.h"
 #include "core/html/PluginDocument.h"
+#include "core/html/canvas/CanvasRenderingContext.h"
+#include "core/html/canvas/CanvasRenderingContext2D.h"
+#include "core/html/canvas/WebGLRenderingContext.h"
 #include "core/html/forms/FormController.h"
 #include "core/html/imports/HTMLImport.h"
 #include "core/html/parser/HTMLDocumentParser.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/parser/NestingLevelIncrementer.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/inspector/InspectorCounters.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/ScriptCallStack.h"
 #include "core/loader/CookieJar.h"
@@ skipping 4552 matching lines @@
     m_ranges.add(range);
 }
 
 void Document::detachRange(Range* range)
 {
     // We don't ASSERT m_ranges.contains(range) to allow us to call this
     // unconditionally to fix: https://bugs.webkit.org/show_bug.cgi?id=26044
     m_ranges.remove(range);
 }
 
-CanvasRenderingContext* Document::getCSSCanvasContext(const String& type, const String& name, int width, int height)
+void Document::getCSSCanvasContext(const String& type, const String& name, int width, int height, bool& is2d, RefPtr<CanvasRenderingContext2D>& context2d, bool& is3d, RefPtr<WebGLRenderingContext>& context3d)
 {
     HTMLCanvasElement& element = getCSSCanvasElement(name);
     element.setSize(IntSize(width, height));
-    return element.getContext(type);
+    CanvasRenderingContext* context = element.getContext(type);
+    if (!context)
+        return;
+
+    if (context->is2d()) {
+        is2d = true;
+        context2d = toCanvasRenderingContext2D(context);
+    } else if (context->is3d()) {
+        is3d = true;
+        context3d = toWebGLRenderingContext(context);

[Stephen White, 2014/02/28 23:36:40]

Wow.. I'd never even thought of trying WebGL as a CSS background. Who knows if
that works.

(This whole feature is a dhyatt special, and has no spec that I know of. We
should probably remove it at some point.)

+    }
 }
 
 HTMLCanvasElement& Document::getCSSCanvasElement(const String& name)
 {
     RefPtr<HTMLCanvasElement>& element = m_cssCanvasElements.add(name, nullptr).storedValue->value;
     if (!element) {
         element = HTMLCanvasElement::create(*this);
         element->setAccelerationDisabled(true);
     }
     return *element;
@@ skipping 709 matching lines @@
 void Document::defaultEventHandler(Event* event)
 {
     if (frame() && frame()->remotePlatformLayer()) {
         frame()->chromeClient().forwardInputEvent(this, event);
         return;
     }
     Node::defaultEventHandler(event);
 }
 
 } // namespace WebCore