Warn on missing OVERRIDE/virtual everywhere, not just in header files.

base/debug/trace_event_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
@@ skipping 214 matching lines @@
   size_t current_iteration_index_;
   std::vector<TraceEvent> logged_events_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceBufferVector);
 };
 
 class TraceBufferDiscardsEvents : public TraceBuffer {
  public:
   virtual ~TraceBufferDiscardsEvents() { }
 
-  virtual void AddEvent(const TraceEvent& event) { }
-  virtual bool HasMoreEvents() const { return false; }
+  virtual void AddEvent(const TraceEvent& event) OVERRIDE {}
+  virtual bool HasMoreEvents() const OVERRIDE { return false; }
 
-  virtual const TraceEvent& NextEvent() {
+  virtual const TraceEvent& NextEvent() OVERRIDE {
     NOTREACHED();
     return *static_cast<TraceEvent*>(NULL);
   }
 
-  virtual bool IsFull() const { return false; }
+  virtual bool IsFull() const OVERRIDE { return false; }
 
-  virtual size_t CountEnabledByName(const unsigned char* category,
-                                    const std::string& event_name) const {
+  virtual size_t CountEnabledByName(
+      const unsigned char* category,
+      const std::string& event_name) const OVERRIDE {
     return 0;
   }
 
-  virtual size_t Size() const { return 0; }
+  virtual size_t Size() const OVERRIDE { return 0; }
 
-  virtual const TraceEvent& GetEventAt(size_t index) const {
+  virtual const TraceEvent& GetEventAt(size_t index) const OVERRIDE {
     NOTREACHED();
     return *static_cast<TraceEvent*>(NULL);
   }
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // TraceEvent
 //
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 1144 matching lines @@
         0,                       // num_args
         NULL,                    // arg_names
         NULL,                    // arg_types
         NULL,                    // arg_values
         TRACE_EVENT_FLAG_NONE);  // flags
   }
 }
 
 }  // namespace trace_event_internal