add custom implementation for drawBitmapRect to shield from changes in SkDevice

git-svn-id: http://skia.googlecode.com/svn/trunk@7696 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index 6d86226..a13d617 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -80,6 +80,9 @@
     virtual void drawPath(const SkDraw&, const SkPath& origpath,
                           const SkPaint& paint, const SkMatrix* prePathMatrix,
                           bool pathIsMutable) SK_OVERRIDE;
+    virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
+                                const SkRect* src, const SkRect& dst,
+                                const SkPaint& paint) SK_OVERRIDE;
     virtual void drawBitmap(const SkDraw&, const SkBitmap& bitmap,
                             const SkIRect* srcRectOrNull,
                             const SkMatrix& matrix, const SkPaint&) SK_OVERRIDE;