Add a check to the FindBadConstructs.cpp clang plugin for bad enum last values.

tools/clang/plugins/ChromeClassTester.h

Index: tools/clang/plugins/ChromeClassTester.h
diff --git a/tools/clang/plugins/ChromeClassTester.h b/tools/clang/plugins/ChromeClassTester.h
index 541341de5391d17a26db0f147c285df481c84fe5..f69a2ffe3f46bd3b92f120ae6b0f9ec77e4a0a98 100644
--- a/tools/clang/plugins/ChromeClassTester.h
+++ b/tools/clang/plugins/ChromeClassTester.h
@@ -55,6 +55,12 @@ class ChromeClassTester : public clang::ASTConsumer {
   virtual void CheckChromeClass(clang::SourceLocation record_location,
                                 clang::CXXRecordDecl* record) = 0;
 
+  // Filtered versions of enum type that are only called with things defined
+  // in chrome header files.
+  virtual void CheckChromeEnum(clang::SourceLocation enum_location,
+                               clang::EnumDecl* enum_decl) {
+  }
+
   // Utility methods used for filtering out non-chrome classes (and ones we
   // deliberately ignore) in HandleTagDeclDefinition().
   std::string GetNamespaceImpl(const clang::DeclContext* context,