Update plugin to handle new style rules for virtual annotations.

tools/clang/plugins/tests/virtual_method_specifiers.cpp

+// Tests for chromium style checks for virtual/override/final specifiers on
+// virtual methods.
+
+// Purposely use macros to test that the FixIt hints don't try to remove the
+// macro body.
+#define OVERRIDE override
+#define FINAL final
+
+// Base class can only use virtual.
+class Base {
+ public:
+  virtual void F() = 0;
+};
+
+// Derived classes correctly use only override or final specifier.
+class CorrectOverride : public Base {
+ public:
+  void F() OVERRIDE {}
+};
+
+class CorrectFinal : public CorrectOverride {
+ public:
+  void F() FINAL {}
+};
+
+// No override on an overridden method should trigger a diagnostic.
+class MissingOverride : public Base {
+ public:
+  virtual void F() {}
+};
+
+// Redundant specifiers should trigger a diagnostic.
+class VirtualAndOverride : public Base {
+ public:
+  virtual void F() OVERRIDE {}
+};
+
+class VirtualAndFinal : public Base {
+ public:
+  virtual void F() FINAL {}
+};
+
+class VirtualAndOverrideFinal : public Base {
+ public:
+  virtual void F() OVERRIDE FINAL {}
+};
+
+class OverrideAndFinal : public Base {
+ public:
+  void F() OVERRIDE FINAL {}
+};