Fixing CssStyleDeclaration to not throw exceptions for unsupported values.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 043abe0f23a7c7c0dd8de294a0c4a37a15d862da..3e72c7174db016c9d7acce11f5456bba8c6938a3 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -2374,11 +2374,14 @@ class CssStyleDeclaration native "*CSSStyleDeclaration" {
   }
 
   void setProperty(String propertyName, String value, [String priority]) {
-    JS('void', '#.setProperty(#, #, #)', this, propertyName, value, priority);
-    // Bug #2772, IE9 requires a poke to actually apply the value.
-    if (JS('bool', '!!#.setAttribute', this)) {
-      JS('void', '#.setAttribute(#, #)', this, propertyName, value);
-    }
+    // try/catch for IE9 which throws on unsupported values.
+    try {
+      JS('void', '#.setProperty(#, #, #)', this, propertyName, value, priority);
+      // Bug #2772, IE9 requires a poke to actually apply the value.
+      if (JS('bool', '!!#.setAttribute', this)) {
+        JS('void', '#.setAttribute(#, #)', this, propertyName, value);
+      }
+    } catch (e) {}
   }
 
   /**