Trivial whitespace fixes.

examples/game/test_performance_computation.dart

@@ -147,7 +147,7 @@ class TestParticleSystem {
       _emitCounter += dt;
     }
 
-    while(_particles.length < maxParticles
+    while (_particles.length < maxParticles
        && _emitCounter > rate
        && (numParticlesToEmit == 0 || _numEmittedParticles < numParticlesToEmit)) {
       // Add a new particle

examples/widgets/indexed_stack.dart

@@ -29,7 +29,7 @@ class IndexedStackDemoState extends State<IndexedStackDemo> {
   }
 
   Widget build(BuildContext context) {
-    List <PopupMenuItem> items = _buildMenu();
+    List<PopupMenuItem> items = _buildMenu();
     IndexedStack indexedStack = new IndexedStack(items, index: _itemIndex, alignment: const FractionalOffset(0.5, 0.0));
 
     return new Scaffold(

packages/flutter/lib/src/rendering/box.dart

@@ -592,7 +592,7 @@ abstract class RenderBox extends RenderObject {
     assert(attached);
     Matrix4 transform = new Matrix4.identity();
     RenderObject renderer = this;
-    while(renderer != null) {
+    while (renderer != null) {
       renderer.applyPaintTransform(transform);
       renderer = renderer.parent;
     }
@@ -604,7 +604,7 @@ abstract class RenderBox extends RenderObject {
   /// Convert the given point from the local coordiante system for this box to
   /// the global coordinate sytem
   Point localToGlobal(Point point) {
-    List <RenderObject> renderers = <RenderObject>[];
+    List<RenderObject> renderers = <RenderObject>[];
     for (RenderObject renderer = this; renderer != null; renderer = renderer.parent)
       renderers.add(renderer);
     Matrix4 transform = new Matrix4.identity();

packages/flutter/lib/src/rendering/object.dart

@@ -614,7 +614,7 @@ abstract class RenderObject extends AbstractNode implements HitTestTarget {
     _debugDoingLayout = true;
     try {
       // TODO(ianh): assert that we're not allowing previously dirty nodes to redirty themeselves
-      while(_nodesNeedingLayout.isNotEmpty) {
+      while (_nodesNeedingLayout.isNotEmpty) {
         List<RenderObject> dirtyNodes = _nodesNeedingLayout;
         _nodesNeedingLayout = new List<RenderObject>();
         dirtyNodes..sort((RenderObject a, RenderObject b) => a.depth - b.depth)..forEach((RenderObject node) {

packages/unit/test/widget/widget_tester.dart

@@ -51,7 +51,7 @@ class WidgetTester {
     if (layer is ContainerLayer) {
       ContainerLayer root = layer;
       Layer child = root.firstChild;
-      while(child != null) {
+      while (child != null) {
         result.addAll(_layers(child));
         child = child.nextSibling;
       }