add SK_OVERRIDE

git-svn-id: http://skia.googlecode.com/svn/trunk@2932 2bbb7eff-a529-9590-31e7-b0007b416f81

include/effects/SkColorMatrixFilter.h

@@ -23,13 +23,13 @@ public:
     void setArray(const SkScalar array[20]);
 
     // overrides from SkColorFilter
-    virtual void filterSpan(const SkPMColor src[], int count, SkPMColor[]);
-    virtual void filterSpan16(const uint16_t src[], int count, uint16_t[]);
-    virtual uint32_t getFlags();
+    virtual void filterSpan(const SkPMColor src[], int count, SkPMColor[]) SK_OVERRIDE;
+    virtual void filterSpan16(const uint16_t src[], int count, uint16_t[]) SK_OVERRIDE;
+    virtual uint32_t getFlags() SK_OVERRIDE;
     virtual bool asColorMatrix(SkScalar matrix[20]) SK_OVERRIDE;
 
     // overrides for SkFlattenable
-    virtual void flatten(SkFlattenableWriteBuffer& buffer);
+    virtual void flatten(SkFlattenableWriteBuffer& buffer) SK_OVERRIDE;
 
     struct State {
         int32_t fArray[20];