Chrome DevTools no longer supports displayName, use name instead

Adds `name` get function to each function object when this flag is
enabled, following the guidance in
https://bugs.chromium.org/p/chromium/issues/detail?id=1178257. The
displayName property is still set for now for backwards compatibility,
and by default neither of these are set, but are hidden behind the
-XmethodNameDisplayMode flag.

Bug: #9735
Change-Id: I1f963607926e111cb6c67a2b2de0de9bbb3a12d3
Bug-Link: https://github.com/gwtproject/gwt/issues/9735

dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java

diff --git a/dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java b/dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java
index 1eebb9d..6647795 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java
@@ -2338,8 +2338,8 @@
       addMethodDefinitionStatement(method, methodDefinitionStatement);
 
       if (shouldEmitDisplayNames()) {
-        JsExprStmt displayNameAssignment = outputDisplayName(functionNameRef, method);
-        addMethodDefinitionStatement(method, displayNameAssignment);
+        addMethodDefinitionStatement(method, outputDisplayName(functionNameRef, method));
+        addMethodDefinitionStatement(method, outputFunctionNameProperty(functionNameRef, method));
       }
     }
 
@@ -2359,6 +2359,21 @@
       return createAssignment(displayName, displayMethodName).makeStmt();
     }
 
+    private JsExprStmt outputFunctionNameProperty(JsNameRef function, JMethod method) {
+      String displayStringName = getDisplayName(method);
+      SourceInfo sourceInfo = function.getSourceInfo();
+      JsStringLiteral displayMethodName =
+          new JsStringLiteral(sourceInfo, displayStringName);
+      JsObjectLiteral props = JsObjectLiteral.builder(sourceInfo)
+              .add(new JsStringLiteral(sourceInfo, "name"), JsObjectLiteral.builder(sourceInfo)
+                      .add("value", displayMethodName)
+                      .build())
+              .build();
+      JsExpression[] args = {function, props};
+      return constructInvocation(sourceInfo, RuntimeConstants.RUNTIME_DEFINE_PROPERTIES, args)
+              .makeStmt();
+    }
+
     private boolean shouldEmitDisplayNames() {
       return methodNameMappingMode != OptionMethodNameDisplayMode.Mode.NONE;
     }