Fixing analyzer warnings on overloading == but not get hashCode.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 316bca75b916b78bbf57994c6b1cf81fc7b88867..2c7c9c3dccd3bb7bfad6ad310b6e9cfb86f20dbc 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -26189,6 +26189,9 @@ class _ClientRect extends NativeFieldWrapperClass1 implements Rect {
         height == other.height;
   }
 
+  int get hashCode => JenkinsSmiHash.hash4(left.hashCode, top.hashCode,
+      width.hashCode, height.hashCode);
+
   /**
    * Computes the intersection of this rectangle and the rectangle parameter.
    * Returns null if there is no intersection.
@@ -29613,6 +29616,8 @@ class Point {
     return x == other.x && y == other.y;
   }
 
+  int get hashCode => JenkinsSmiHash.hash2(x.hashCode, y.hashCode);
+
   Point operator +(Point other) {
     return new Point(x + other.x, y + other.y);
   }
@@ -29735,6 +29740,9 @@ class Rect {
         height == other.height;
   }
 
+  int get hashCode => JenkinsSmiHash.hash4(left.hashCode, top.hashCode,
+      width.hashCode, height.hashCode);
+
   /**
    * Computes the intersection of this rectangle and the rectangle parameter.
    * Returns null if there is no intersection.