Rename rendering/render_*.dart to rendering/*.dart

sky/sdk/lib/framework/rendering/render_paragraph.dart

-// 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.
-
-import 'dart:sky' as sky;
-import 'render_box.dart';
-import 'render_node.dart';
-
-class RenderInline extends RenderNode {
-  String data;
-
-  RenderInline(this.data);
-}
-
-class RenderParagraph extends RenderBox {
-
-  RenderParagraph({
-    String text,
-    int color
-  }) : _color = color {
-    _layoutRoot.rootElement = _document.createElement('p');
-    this.text = text;
-  }
-
-  final sky.Document _document = new sky.Document();
-  final sky.LayoutRoot _layoutRoot = new sky.LayoutRoot();
-
-  String get text => (_layoutRoot.rootElement.firstChild as sky.Text).data;
-  void set text (String value) {
-    _layoutRoot.rootElement.setChild(_document.createText(value));
-    markNeedsLayout();
-  }
-
-  int _color = 0xFF000000;
-  int get color => _color;
-  void set color (int value) {
-    if (_color != value) {
-      _color = value;
-      markNeedsPaint();
-    }
-  }
-
-  sky.Size getIntrinsicDimensions(BoxConstraints constraints) {
-    assert(false);
-    return null;
-    // we don't currently support this for RenderParagraph
-  }
-
-  void performLayout() {
-    _layoutRoot.maxWidth = constraints.maxWidth;
-    _layoutRoot.minWidth = constraints.minWidth;
-    _layoutRoot.minHeight = constraints.minHeight;
-    _layoutRoot.maxHeight = constraints.maxHeight;
-    _layoutRoot.layout();
-    size = constraints.constrain(new sky.Size(_layoutRoot.rootElement.width, _layoutRoot.rootElement.height));
-  }
-
-  void paint(RenderNodeDisplayList canvas) {
-    // _layoutRoot.rootElement.style['color'] = 'rgba(' + ...color... + ')';
-    _layoutRoot.paint(canvas);
-  }
-
-  // we should probably expose a way to do precise (inter-glpyh) hit testing
-}