Add JS compiler bug link

src/lib/updating-element.ts

@@ -193,8 +193,9 @@ type UpdateState = typeof STATE_HAS_UPDATED|typeof STATE_UPDATE_REQUESTED|
 
 /**
  * The Closure JS Compiler doesn't currently have good support for static
- * property semantics where "this" is dynamic, so we use this hack to bypass
- * any rewriting by the compiler.
+ * property semantics where "this" is dynamic (e.g.
+ * https://github.com/google/closure-compiler/issues/3177 and others) so we use
+ * this hack to bypass any rewriting by the compiler.
  */
 const finalized = 'finalized';
 
@@ -220,7 +221,7 @@ export abstract class UpdatingElement extends HTMLElement {
   /**
    * Marks class as having finished creating properties.
    */
-  protected static [finalized] = true;
+  protected static[finalized] = true;
 
   /**
    * Memoized list of all class properties, including any superclass properties.

src/lit-element.ts

@@ -67,7 +67,7 @@ export class LitElement extends UpdatingElement {
    * Note this property name is a string to prevent breaking Closure JS Compiler
    * optimizations. See updating-element.ts for more information.
    */
-  protected static ['finalized'] = true;
+  protected static['finalized'] = true;
   /**
    * Render method used to render the lit-html TemplateResult to the element's
    * DOM.
@@ -89,7 +89,7 @@ export class LitElement extends UpdatingElement {
   /** @nocollapse */
   protected static finalize() {
     // The Closure JS Compiler does not always preserve the correct "this"
-    // when calling static super methods, so explicitly bind here.
+    // when calling static super methods (b/137460243), so explicitly bind.
     super.finalize.apply(this);
     // Prepare styling that is stamped at first render time. Styling
     // is built from user provided `styles` or is inherited from the superclass.