Rename setParentData to setupParentData since it's not a setter per se.

sky/sdk/lib/rendering/README.md

 Sky Rendering
 =============
 
 The Sky render tree is a low-level layout and painting system based on a
 retained tree of objects that inherit from [`RenderObject`](object.dart). Most
 developers using Sky will not need to interact directly with the rendering tree.
 Instead, most developers should use [Sky widgets](../widgets/README.md), which
 are built using the render tree.
 
 Overview
@@ skipping 61 matching lines @@
  * `ContainerRenderObjectMixin` is useful for subclasses of `RenderObject` that
    have a child list.
 
 Subclasses of `RenderObject` are not required to use either of these child
 models and are free to invent novel child models for their specific use cases.
 
 ### Parent Data
 
 TODO(ianh): Describe the parent data concept.
 
-The `setParentData()` method is automatically called for each child
+The `setupParentData()` method is automatically called for each child
 when the child's parent is changed. However, if you need to
 preinitialise the `parentData` member to set its values before you add
 a node to its parent, you can preemptively call that future parent's
-`setParentData()` method with the future child as the argument.
+`setupParentData()` method with the future child as the argument.
 
 ### Box Model
 
 #### Dimensions
 
 All dimensions are expressed as logical pixel units. Font sizes are
 also in logical pixel units. Logical pixel units are approximately
 96dpi, but the precise value varies based on the hardware, in such a
 way as to optimise for performance and rendering quality while keeping
 interfaces roughly the same size across devices regardless of the
@@ skipping 50 matching lines @@
 
 A subclass of `RenderObject` must fulfill the following contract:
 
 * It must fulfill the [AbstractNode contract](../base/README.md) when
   dealing with children. Using `RenderObjectWithChildMixin` or
   `ContainerRenderObjectMixin` can make this easier.
 
 * Information about the child managed by the parent, e.g. typically
   position information and configuration for the parent's layout,
   should be stored on the `parentData` member; to this effect, a
-  ParentData subclass should be defined and the `setParentData()`
+  ParentData subclass should be defined and the `setupParentData()`
   method should be overriden to initialise the child's parent data
   appropriately.
 
 * Layout constraints must be expressed in a Constraints subclass. This
   subclass must implement operator== (and hashCode).
 
 * Whenever the layout needs updating, the `markNeedsLayout()` method
   should be called.
 
 * Whenever the rendering needs updating without changing the layout,
@@ skipping 33 matching lines @@
 ### The RenderBox contract
 
 A `RenderBox` subclass is required to implement the following contract:
 
 * It must fulfill the [AbstractNode contract](../base/README.md) when
   dealing with children. Note that using `RenderObjectWithChildMixin`
   or `ContainerRenderObjectMixin` takes care of this for you, assuming
   you fulfill their contract instead.
 
 * If it has any data to store on its children, it must define a
-  BoxParentData subclass and override setParentData() to initialise
+  BoxParentData subclass and override setupParentData() to initialise
   the child's parent data appropriately, as in the following example.
   (If the subclass has an opinion about what type its children must
   be, e.g. the way that `RenderBlock` wants its children to be
-  `RenderBox` nodes, then change the `setParentData()` signature
+  `RenderBox` nodes, then change the `setupParentData()` signature
   accordingly, to catch misuse of the method.)
 
 ```dart
   class FooParentData extends BoxParentData { ... }
 
   // In RenderFoo
-  void setParentData(RenderObject child) {
+  void setupParentData(RenderObject child) {
     if (child.parentData is! FooParentData)
       child.parentData = new FooParentData();
   }
 ```
 
 * The class must encapsulate a layout algorithm that has the following
   features:
 
 ** It uses as input a set of constraints, described by a
    BoxConstraints object, and a set of zero or more children, as
@@ skipping 119 matching lines @@
 
 * Avoid using save/restore on canvases.
 
 
 Dependencies
 ------------
 
  * [`package:sky/base`](../base)
  * [`package:sky/mojo`](../mojo)
  * [`package:sky/animation`](../mojo)