DevTools: mute struct-related violations for snippets containing 'Symbol'.

Review-Url: https://codereview.chromium.org/2619933003
Cr-Commit-Position: refs/heads/master@{#442614}

third_party/WebKit/Source/devtools/scripts/closure/closure_runner/src/org/chromium/devtools/compiler/Runner.java

@@ -3,6 +3,7 @@ package org.chromium.devtools.compiler;
 import com.google.common.collect.Lists;
 import com.google.common.io.Resources;
 import com.google.javascript.jscomp.*;
+import com.google.javascript.jscomp.Compiler;
 
 import org.kohsuke.args4j.CmdLineException;
 import org.kohsuke.args4j.CmdLineParser;
@@ -192,6 +193,21 @@ public class Runner {
             options.setCodingConvention(new DevToolsCodingConvention());
         }
 
+        @Override
+        protected Compiler createCompiler() {
+            Compiler compiler = new Compiler();
+            final LightweightMessageFormatter formatter = new LightweightMessageFormatter(compiler);
+            compiler.setErrorManager(new PrintStreamErrorManager(formatter, getErrorPrintStream()) {
+                @Override
+                public void report(CheckLevel level, JSError error) {
+                    String text = formatter.formatError(error);
+                    if (text.indexOf("access on a struct") == -1 || text.indexOf("Symbol") == -1)
+                        super.report(level, error);
+                }
+            });
+            return compiler;
+        }
+
         int execute() {
             try {
                 return doRun();