Add ignores for dynamic calls in html_dart2js sanitizing code.

Avoid removing dynamic invocations in sanitizing code as we don't know what type the element and its attributes may be.

Change-Id: I057d908027befe7fd284bf4ec6c68bd1d0e977f4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/259108
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Leaf Petersen <leafp@google.com>
Commit-Queue: Kallen Tu <kallentu@google.com>

sdk/lib/html/dart2js/html_dart2js.dart

@@ -41126,7 +41126,11 @@ class _ValidatingTreeSanitizer implements NodeTreeSanitizer {
     var isAttr;
     try {
       // If getting/indexing attributes throws, count that as corrupt.
+      // Don't remove dynamic calls in sanitizing code.
+      // ignore: avoid_dynamic_calls
       attrs = element.attributes;
+      // Don't remove dynamic calls in sanitizing code.
+      // ignore: avoid_dynamic_calls
       isAttr = attrs['is'];
       var corruptedTest1 = Element._hasCorruptedAttributes(element);
 
@@ -41187,7 +41191,11 @@ class _ValidatingTreeSanitizer implements NodeTreeSanitizer {
     for (var i = attrs.length - 1; i >= 0; --i) {
       var name = keys[i];
       if (!validator.allowsAttribute(
-          element, name.toLowerCase(), attrs[name])) {
+          element,
+          // Don't remove dynamic calls in sanitizing code.
+          // ignore: avoid_dynamic_calls
+          name.toLowerCase(),
+          attrs[name])) {
         window.console.warn('Removing disallowed attribute '
             '<$tag $name="${attrs[name]}">');
         attrs.remove(name);

tools/dom/src/Validators.dart

@@ -229,7 +229,11 @@ class _ValidatingTreeSanitizer implements NodeTreeSanitizer {
     var isAttr;
     try {
       // If getting/indexing attributes throws, count that as corrupt.
+      // Don't remove dynamic calls in sanitizing code.
+      // ignore: avoid_dynamic_calls
       attrs = element.attributes;
+      // Don't remove dynamic calls in sanitizing code.
+      // ignore: avoid_dynamic_calls
       isAttr = attrs['is'];
       var corruptedTest1 = Element._hasCorruptedAttributes(element);
 
@@ -290,7 +294,11 @@ class _ValidatingTreeSanitizer implements NodeTreeSanitizer {
     for (var i = attrs.length - 1; i >= 0; --i) {
       var name = keys[i];
       if (!validator.allowsAttribute(
-          element, name.toLowerCase(), attrs[name])) {
+          element,
+          // Don't remove dynamic calls in sanitizing code.
+          // ignore: avoid_dynamic_calls
+          name.toLowerCase(),
+          attrs[name])) {
         window.console.warn('Removing disallowed attribute '
             '<$tag $name="${attrs[name]}">');
         attrs.remove(name);