Revert "Bug 1438425 - Delete DocumentRenderer. r=jesup, a=RyanVM"

This reverts commit 5b69e05939c7fd3f917e2dd0f399774b3b15c886.

dom/canvas/DocumentRendererChild.h

@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_DocumentRendererChild
+#define mozilla_dom_DocumentRendererChild
+
+#include "mozilla/ipc/PDocumentRendererChild.h"
+#include "nsString.h"
+#include "gfxContext.h"
+
+class nsIDOMWindow;
+
+namespace mozilla {
+namespace ipc {
+
+class DocumentRendererChild : public PDocumentRendererChild
+{
+public:
+    DocumentRendererChild();
+    virtual ~DocumentRendererChild();
+
+    bool RenderDocument(nsPIDOMWindowOuter* window,
+                        const nsRect& documentRect, const gfx::Matrix& transform,
+                        const nsString& bgcolor,
+                        uint32_t renderFlags, bool flushLayout,
+                        const nsIntSize& renderSize, nsCString& data);
+
+private:
+
+    DISALLOW_EVIL_CONSTRUCTORS(DocumentRendererChild);
+};
+
+} // namespace ipc
+} // namespace mozilla
+
+#endif