[Layout] Layout API based on content area (#2110)

* Initial commit for adding a size constraint to ASLayoutable's

* Some more commits

* Fix sample projects in extra/

* Remove preferredFrameSize test of ASEditableTextNode

* Remove preferredFrameSize from examples_extra

* Add deprecation warning to -[ASDisplayNode preferredFrameSize]

* Add deprecation warning to -[ASDisplayNode measureWithSizeRange:]

* Commit

* Commit

* Remove ASRelativeSizeRange

* Make ASRelativeSize private

* Adjust examples

* Improve setting of -[ASLayoutable size] with points or fractions

* Add ASWrapperLayoutSpec

* Improve creation of ASRelativeDimension

* Add `preferredFrameSize` back and add deprecated logging

* Add `layoutSpecBlock` setter and getter and add locking for it

* Add better documentation and fix macros to create ASRelativeDimension

* Create new ASSizeRangeMake with just a CGSize as parameter

* Update Kitten and Social App Layout example

* Add layoutThatFits: and deprecate measure:

* Rename ASRelativeDimension to ASDimension

* Fix examples for ASDimension renaming

* Remove fancy height and width setter

* Fix ASDimension helper

* Rename -[ASLayout layoutableObject] to -[ASLayout layoutable]

* Update layout related methods and more clearer documentation around how to use it

* Deprecate old ASLayout class constructors

* Don't unnecessary recalculate layout if constrained or parent size did not change

* Use shared pointer for ASDisplayNodeLayout

* Fix rebase conflicts

* Add documentation and move implementation in mm file of ASDisplayNodeLayout

* Fix test errors

* Rename ASSize to ASLayoutableSize

* Address comments

* Rename setSizeFromCGSize to setSizeWithCGSize

* Improve inline functions in ASDimension

* Fix rebase conflicts

AsyncDisplayKit/Private/ASDisplayNodeLayout.h

@@ -0,0 +1,58 @@
+//
+//  ASDisplayNodeLayout.h
+//  AsyncDisplayKit
+//
+//  Created by Michael Schneider on 08/26/16.
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+
+#pragma once
+
+#import "ASDimension.h"
+
+@class ASLayout;
+
+/*
+ * Represents a connection between an ASLayout and a ASDisplayNode
+ * ASDisplayNode uses this to store additional information that are necessary besides the layout
+ */
+struct ASDisplayNodeLayout {
+  ASLayout *layout;
+  ASSizeRange constrainedSize;
+  CGSize parentSize;
+  BOOL _dirty;
+  
+  /*
+   * Create a new display node layout with
+   * @param layout The layout to associate, usually returned from a call to -layoutThatFits:parentSize:
+   * @param constrainedSize Constrained size used to create the layout
+   * @param parentSize Parent size used to create the layout
+   */
+  ASDisplayNodeLayout(ASLayout *layout, ASSizeRange constrainedSize, CGSize parentSize)
+  : layout(layout), constrainedSize(constrainedSize), parentSize(parentSize), _dirty(NO) {};
+  
+  /*
+   * Creates a layout without any layout associated. By default this display node layout is dirty.
+   */
+  ASDisplayNodeLayout()
+  : layout(nil), constrainedSize({{0, 0}, {0, 0}}), parentSize({0, 0}), _dirty(YES) {};
+  
+  /**
+   * Returns if the display node layout is dirty as it was invalidated or it was created without a layout.
+   */
+  BOOL isDirty();
+  
+  /**
+   * Returns if ASDisplayNode is still valid for a given constrained and parent size
+   */
+  BOOL isValidForConstrainedSizeParentSize(ASSizeRange constrainedSize, CGSize parentSize);
+  
+  /**
+   * Invalidate the display node layout
+   */
+  void invalidate();
+};