Fix chip.

Runtime/material/chip.cs

             float? elevation = null,
             ShapeBorder avatarBorder = null
         ) : base(key: key) {
-            D.assert(selected != null);
-            D.assert(onSelected != null);
-            D.assert(clipBehavior != null);
             D.assert(pressElevation == null || pressElevation >= 0.0f);
             D.assert(elevation == null || elevation >= 0.0f);
             this._avatarBorder = avatarBorder ?? new CircleBorder();
         ) : base(key: key) {
             D.assert(label != null);
             D.assert(isEnabled != null);
-            D.assert(clipBehavior != null);
             D.assert(pressElevation == null || pressElevation >= 0.0f);
             D.assert(elevation == null || elevation >= 0.0f);
             deleteIcon = deleteIcon ?? ChipUtils._kDefaultDeleteIcon;
             ChipThemeData chipTheme = ChipTheme.of(context);
             TextDirection textDirection = Directionality.of(context);
             ShapeBorder shape = this.widget.shape ?? chipTheme.shape;
-            float elevation = this.widget.elevation ?? chipTheme.elevation ?? _defaultElevation;
-            float pressElevation = this.widget.pressElevation ?? chipTheme.pressElevation ?? _defaultPressElevation;
+            float elevation = this.widget.elevation ?? (chipTheme.elevation ?? _defaultElevation);
+            float pressElevation = this.widget.pressElevation ?? (chipTheme.pressElevation ?? _defaultPressElevation);
 
             Widget result = new Material(
                 elevation: this.isTapping ? pressElevation : elevation,
                 )
             );
             BoxConstraints constraints;
-            switch (this.widget.materialTapTargetSize) {
+            switch (this.widget.materialTapTargetSize ?? theme.materialTapTargetSize) {
                 case MaterialTapTargetSize.padded:
                     constraints = new BoxConstraints(minHeight: 48.0f);
                     break;
         }
 
         void _mountChild(Widget widget, _ChipSlot slot) {
-            Element oldChild = this.slotToChild[slot];
+            Element oldChild = this.slotToChild.getOrDefault(slot);
             Element newChild = this.updateChild(oldChild, widget, slot);
             if (oldChild != null) {
                 this.slotToChild.Remove(slot);
             }
         }
 
-        protected override void insertChildRenderObject(RenderObject child, dynamic slotValue) {
+        protected override void insertChildRenderObject(RenderObject child, object slotValue) {
-            _ChipSlot slot = slotValue;
+            _ChipSlot slot = (_ChipSlot) slotValue;
             this._updateRenderObject(child, slot);
             D.assert(this.renderObject.childToSlot.ContainsKey((RenderBox) child));
             D.assert(this.renderObject.slotToChild.ContainsKey(slot));
             D.assert(!this.renderObject.slotToChild.ContainsKey((_ChipSlot) this.slot));
         }
 
-        protected override void moveChildRenderObject(RenderObject child, dynamic slotValue) {
+        protected override void moveChildRenderObject(RenderObject child, object slotValue) {
             D.assert(false, "not reachable");
         }
     }
         }
 
         public static bool operator ==(_ChipRenderTheme left, _ChipRenderTheme right) {
-            return left.Equals(right);
+            return Equals(left, right);
-            return !left.Equals(right);
+            return !Equals(left, right);
         }
 
         public override int GetHashCode() {
         ) {
             D.assert(theme != null);
             this._theme = theme;
-            this.checkmarkAnimation.addListener(this.markNeedsPaint);
+            checkmarkAnimation.addListener(this.markNeedsPaint);
-            this.deleteDrawerAnimation.addListener(this.markNeedsLayout);
+            deleteDrawerAnimation.addListener(this.markNeedsLayout);
             enableAnimation.addListener(this.markNeedsPaint);
             this.value = value;
             this.isEnabled = isEnabled;
 
 
             const float left = 0.0f;
-            float right = overallSize.width;
-                return new Offset(x - boxSize.width, (contentSize - boxSize.height) / 2.0f);
+                return new Offset(x, (contentSize - boxSize.height) / 2.0f);
             }
 
             Offset avatarOffset = Offset.zero;
             );
             this.size = this.constraints.constrain(paddedSize);
             D.assert(this.size.height == this.constraints.constrainHeight(paddedSize.height),
-                "Constrained height ${size.height} doesn't match expected height " +
-                "${constraints.constrainWidth(paddedSize.height)}");
+                $"Constrained height {this.size.height} doesn't match expected height " +
+                $"{this.constraints.constrainWidth(paddedSize.height)}");
-                "Constrained width ${size.width} doesn't match expected width " +
-                "${constraints.constrainWidth(paddedSize.width)}");
+                $"Constrained width {this.size.width} doesn't match expected width " +
+                $"{this.constraints.constrainWidth(paddedSize.width)}");
         }
 
         static ColorTween selectionScrimTween = new ColorTween(

Runtime/material/chip_theme.cs

         }
 
         public static bool operator ==(ChipThemeData left, ChipThemeData right) {
-            return left.Equals(right);
+            return Equals(left, right);
-            return !left.Equals(right);
+            return !Equals(left, right);
         }
 
         public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {

Runtime/material/theme_data.cs

             D.assert(typography != null);
             D.assert(buttonColor != null);
             D.assert(tabBarTheme != null);
+            D.assert(chipTheme != null);
             D.assert(dialogTheme != null);
 
             this.brightness = brightness ?? Brightness.light;
             this.primaryIconTheme = primaryIconTheme;
             this.accentIconTheme = accentIconTheme;
             this.tabBarTheme = tabBarTheme;
+            this.chipTheme = chipTheme;
             this.platform = platform.Value;
             this.materialTapTargetSize = materialTapTargetSize ?? MaterialTapTargetSize.padded;
             this.pageTransitionsTheme = pageTransitionsTheme;
             D.assert(typography != null);
             D.assert(buttonColor != null);
             D.assert(tabBarTheme != null);
+            D.assert(chipTheme != null);
             D.assert(dialogTheme != null);
 
             return new ThemeData(
                 primaryIconTheme: primaryIconTheme,
                 accentIconTheme: accentIconTheme,
                 tabBarTheme: tabBarTheme,
+                chipTheme: chipTheme,
                 platform: platform,
                 materialTapTargetSize: materialTapTargetSize,
                 pageTransitionsTheme: pageTransitionsTheme,
             IconThemeData primaryIconTheme = null,
             IconThemeData accentIconTheme = null,
             TabBarTheme tabBarTheme = null,
-            ChipThemeData chimpTheme = null,
+            ChipThemeData chipTheme = null,
             RuntimePlatform? platform = null,
             MaterialTapTargetSize? materialTapTargetSize = null,
             PageTransitionsTheme pageTransitionsTheme = null,
                 primaryIconTheme: primaryIconTheme ?? this.primaryIconTheme,
                 accentIconTheme: accentIconTheme ?? this.accentIconTheme,
                 tabBarTheme: tabBarTheme ?? this.tabBarTheme,
+                chipTheme: chipTheme ?? this.chipTheme,
                 platform: platform ?? this.platform,
                 materialTapTargetSize: materialTapTargetSize ?? this.materialTapTargetSize,
                 pageTransitionsTheme: pageTransitionsTheme ?? this.pageTransitionsTheme,
                    other.primaryIconTheme == this.primaryIconTheme &&
                    other.accentIconTheme == this.accentIconTheme &&
                    other.tabBarTheme == this.tabBarTheme &&
+                   other.chipTheme == this.chipTheme &&
                    other.platform == this.platform &&
                    other.materialTapTargetSize == this.materialTapTargetSize &&
                    other.pageTransitionsTheme == this.pageTransitionsTheme &&
                 hashCode = (hashCode * 397) ^ this.primaryIconTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ this.accentIconTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ this.tabBarTheme.GetHashCode();
+                hashCode = (hashCode * 397) ^ this.chipTheme.GetHashCode();
                 hashCode = (hashCode * 397) ^ this.platform.GetHashCode();
                 hashCode = (hashCode * 397) ^ this.materialTapTargetSize.GetHashCode();
                 hashCode = (hashCode * 397) ^ this.pageTransitionsTheme.GetHashCode();

Samples/UIWidgetsGallery/demo/material/chip_demo.cs

         };
 
         public static readonly Dictionary<string, string> _avatars = new Dictionary<string, string> {
-            {"hammer", "people/square/ali.png"},
-            {"chisel", "people/square/sandra.png"},
-            {"fryer", "people/square/trevor.png"},
-            {"fabricator", "people/square/stella.png"},
-            {"customer", "people/square/peter.png"}
+            {"hammer", "people/square/ali"},
+            {"chisel", "people/square/sandra"},
+            {"fryer", "people/square/trevor"},
+            {"fabricator", "people/square/stella"},
+            {"customer", "people/square/peter"}
         };
 
         public static readonly Dictionary<string, HashSet<string>> _toolActions =