Use Polymer.dom with many dom manipulations.

tracing/tracing/ui/base/ui_test.html

Index: tracing/tracing/ui/base/ui_test.html
diff --git a/tracing/tracing/ui/base/ui_test.html b/tracing/tracing/ui/base/ui_test.html
index 0a7e0d3651c97af152ce5c46f849f5694289e8ee..4cace3aa243d6667b6b22a1440085c8704d2c72e 100644
--- a/tracing/tracing/ui/base/ui_test.html
+++ b/tracing/tracing/ui/base/ui_test.html
@@ -194,14 +194,14 @@ tr.b.unittest.testSuite(function() {
       __proto__: HTMLDivElement.prototype,
 
       decorate: function() {
-        this.setAttribute('width', 200);
-        this.setAttribute('height', 200);
-        this.setAttribute('viewPort', '0 0 200 200');
+        Polymer.dom(this).setAttribute('width', 200);
+        Polymer.dom(this).setAttribute('height', 200);
+        Polymer.dom(this).setAttribute('viewPort', '0 0 200 200');
         var rectEl = document.createElementNS(svgNS, 'rect');
-        rectEl.setAttribute('x', 10);
-        rectEl.setAttribute('y', 10);
-        rectEl.setAttribute('width', 180);
-        rectEl.setAttribute('height', 180);
+        Polymer.dom(rectEl).setAttribute('x', 10);
+        Polymer.dom(rectEl).setAttribute('y', 10);
+        Polymer.dom(rectEl).setAttribute('width', 180);
+        Polymer.dom(rectEl).setAttribute('height', 180);
         Polymer.dom(this).appendChild(rectEl);
       }
     };
@@ -218,14 +218,14 @@ tr.b.unittest.testSuite(function() {
       __proto__: HTMLDivElement.prototype,
 
       decorate: function() {
-        this.setAttribute('width', 200);
-        this.setAttribute('height', 200);
-        this.setAttribute('viewPort', '0 0 200 200');
+        Polymer.dom(this).setAttribute('width', 200);
+        Polymer.dom(this).setAttribute('height', 200);
+        Polymer.dom(this).setAttribute('viewPort', '0 0 200 200');
         var rectEl = document.createElementNS(svgNS, 'rect');
-        rectEl.setAttribute('x', 10);
-        rectEl.setAttribute('y', 10);
-        rectEl.setAttribute('width', 180);
-        rectEl.setAttribute('height', 180);
+        Polymer.dom(rectEl).setAttribute('x', 10);
+        Polymer.dom(rectEl).setAttribute('y', 10);
+        Polymer.dom(rectEl).setAttribute('width', 180);
+        Polymer.dom(rectEl).setAttribute('height', 180);
         Polymer.dom(this).appendChild(rectEl);
       }
     };