Add OVERRIDE to gpu/ and gl/.

gpu/command_buffer/service/shader_translator.h

Index: gpu/command_buffer/service/shader_translator.h
diff --git a/gpu/command_buffer/service/shader_translator.h b/gpu/command_buffer/service/shader_translator.h
index 9f5e7663be1ccfceadde8e263ef5dfa836be77b6..af132b9400075bc01d9f816eec6c064476f8e64c 100644
--- a/gpu/command_buffer/service/shader_translator.h
+++ b/gpu/command_buffer/service/shader_translator.h
@@ -83,18 +83,18 @@ class ShaderTranslator : public ShaderTranslatorInterface {
       ShShaderSpec shader_spec,
       const ShBuiltInResources* resources,
       GlslImplementationType glsl_implementation_type,
-      GlslBuiltInFunctionBehavior glsl_built_in_function_behavior);
+      GlslBuiltInFunctionBehavior glsl_built_in_function_behavior) OVERRIDE;
 
   // Overridden from ShaderTranslatorInterface.
-  virtual bool Translate(const char* shader);
+  virtual bool Translate(const char* shader) OVERRIDE;
 
   // Overridden from ShaderTranslatorInterface.
-  virtual const char* translated_shader() const;
-  virtual const char* info_log() const;
+  virtual const char* translated_shader() const OVERRIDE;
+  virtual const char* info_log() const OVERRIDE;
 
   // Overridden from ShaderTranslatorInterface.
-  virtual const VariableMap& attrib_map() const;
-  virtual const VariableMap& uniform_map() const;
+  virtual const VariableMap& attrib_map() const OVERRIDE;
+  virtual const VariableMap& uniform_map() const OVERRIDE;
 
  private:
   void ClearResults();