Fix analyzer warnings

packages/flutter/example/fitness/lib/home.dart

@@ -14,7 +14,6 @@ import 'package:sky/widgets/drawer_item.dart';
 import 'package:sky/widgets/floating_action_button.dart';
 import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/icon.dart';
-import 'package:sky/widgets/ink_well.dart';
 import 'package:sky/widgets/material.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/scaffold.dart';

packages/flutter/example/fitness/lib/measurement.dart

@@ -4,7 +4,6 @@
 
 import 'package:sky/editing/input.dart';
 import 'package:sky/widgets/basic.dart';
-import 'package:sky/widgets/flat_button.dart';
 import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/ink_well.dart';
 import 'package:sky/widgets/material.dart';

packages/flutter/example/raw/mutating-dom.dart

@@ -148,26 +148,27 @@ void doFrame(double timeStamp) {
         break;
       }
     } else {
-      assert(node is sky.Text); // 
+      assert(node is sky.Text); //
+      final sky.Text text = node;
       if (pickThis(0.1)) {
         report("appending a new text node (ASCII)");
-        node.appendData(generateCharacter(0x20, 0x7F));
+        text.appendData(generateCharacter(0x20, 0x7F));
         break;
       } else if (pickThis(0.05)) {
         report("appending a new text node (Latin1)");
-        node.appendData(generateCharacter(0x20, 0xFF));
+        text.appendData(generateCharacter(0x20, 0xFF));
         break;
       } else if (pickThis(0.025)) {
         report("appending a new text node (BMP)");
-        node.appendData(generateCharacter(0x20, 0xFFFF));
+        text.appendData(generateCharacter(0x20, 0xFFFF));
         break;
       } else if (pickThis(0.0125)) {
         report("appending a new text node (Unicode)");
-        node.appendData(generateCharacter(0x20, 0x10FFFF));
+        text.appendData(generateCharacter(0x20, 0x10FFFF));
         break;
-      } else if (node.length > 1 && pickThis(0.1)) {
+      } else if (text.length > 1 && pickThis(0.1)) {
         report("deleting character from Text node");
-        node.deleteData(random.nextInt(node.length), 1);
+        text.deleteData(random.nextInt(text.length), 1);
         break;
       }
     }
@@ -178,7 +179,7 @@ void doFrame(double timeStamp) {
   int count = 1;
   while (node != null) {
     if (node is sky.Element && node.firstChild != null) {
-      node = node.firstChild;
+      node = (node as sky.Element).firstChild;
       count += 1;
     } else {
       while (node != null && node.nextSibling == null)

packages/flutter/example/rendering/align_items.dart

@@ -20,7 +20,7 @@ void main() {
     TextStyle style = const TextStyle(color: const Color(0xFF000000));
     RenderParagraph paragraph = new RenderParagraph(new InlineStyle(style, [new InlineText("${alignItems}")]));
     table.add(new RenderPadding(child: paragraph, padding: new EdgeDims.only(top: 20.0)));
-    var row = new RenderFlex(alignItems: alignItems, baseline: TextBaseline.alphabetic);
+    var row = new RenderFlex(alignItems: alignItems, textBaseline: TextBaseline.alphabetic);
 
     style = new TextStyle(fontSize: 15.0, color: const Color(0xFF000000));
     row.add(new RenderDecoratedBox(
@@ -32,7 +32,7 @@ void main() {
       decoration: new BoxDecoration(backgroundColor: const Color(0x7FCCFFCC)),
       child: new RenderParagraph(new InlineStyle(style, [new InlineText('foo foo foo')]))
     ));
-    var subrow = new RenderFlex(alignItems: alignItems, baseline: TextBaseline.alphabetic);
+    var subrow = new RenderFlex(alignItems: alignItems, textBaseline: TextBaseline.alphabetic);
     style = new TextStyle(fontSize: 25.0, color: const Color(0xFF000000));
     subrow.add(new RenderDecoratedBox(
       decoration: new BoxDecoration(backgroundColor: const Color(0x7FCCCCFF)),

packages/flutter/example/widgets/card_collection.dart

@@ -44,7 +44,7 @@ class ShrinkingCard extends AnimatedComponent {
   Function onUpdated;
   Function onCompleted;
 
-  double get currentHeight => card.performance.variable.value;
+  double get currentHeight => (card.performance.variable as AnimatedType).value;
 
   void initState() {
     assert(card.performance != null);