Add toString methods to SkImageFilter-derived classes

include/effects/SkDropShadowImageFilter.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColor.h"
 #include "SkImageFilter.h"
 #include "SkScalar.h"
 
 class SK_API SkDropShadowImageFilter : public SkImageFilter {
 public:
     enum ShadowMode {
         kDrawShadowAndForeground_ShadowMode,
-        kDrawShadowOnly_ShadowMode
+        kDrawShadowOnly_ShadowMode,
+
+        kLast_ShadowMode = kDrawShadowOnly_ShadowMode
     };
 
+    static const int kShadowModeCount = kLast_ShadowMode+1;
+
     /** @deprecated use another Create function below instead */
     static SkDropShadowImageFilter* Create(SkScalar dx, SkScalar dy,
                                            SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                            SkImageFilter* input = NULL,
                                            const CropRect* cropRect = NULL,
                                            uint32_t uniqueID = 0) {
         return SkNEW_ARGS(SkDropShadowImageFilter, (dx, dy, sigmaX, sigmaY, color,
                                                     kDrawShadowAndForeground_ShadowMode,
                                                     input, cropRect, uniqueID));
     }
 
     static SkDropShadowImageFilter* Create(SkScalar dx, SkScalar dy,
                                            SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                            ShadowMode shadowMode,
                                            SkImageFilter* input,
                                            const CropRect* cropRect,
                                            uint32_t uniqueID) {
         return SkNEW_ARGS(SkDropShadowImageFilter, (dx, dy, sigmaX, sigmaY, color,
                                                     shadowMode, input, cropRect, uniqueID));
     }
 
     static SkDropShadowImageFilter* Create(SkScalar dx, SkScalar dy,
                                            SkScalar sigmaX, SkScalar sigmaY, SkColor color,
                                            ShadowMode shadowMode) {
         return SkNEW_ARGS(SkDropShadowImageFilter, (dx, dy, sigmaX, sigmaY, color,
                                                     shadowMode, NULL, NULL, 0));
     }
 
     virtual void computeFastBounds(const SkRect&, SkRect*) const SK_OVERRIDE;
+    SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
 
 protected:
     SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
                             ShadowMode shadowMode, SkImageFilter* input, const CropRect* cropRect,
                             uint32_t uniqueID);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     virtual bool onFilterImage(Proxy*, const SkBitmap& source, const Context&, SkBitmap* result, SkIPoint* loc) const SK_OVERRIDE;
     virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&,
                                 SkIRect* dst) const SK_OVERRIDE;
 
 private:
     SkScalar fDx, fDy, fSigmaX, fSigmaY;
     SkColor fColor;
     ShadowMode fShadowMode;
     typedef SkImageFilter INHERITED;
 };