Add toString methods to SkImageFilter-derived classes

src/effects/SkPictureImageFilter.cpp

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPictureImageFilter.h"
 #include "SkDevice.h"
 #include "SkCanvas.h"
@@ skipping 149 matching lines @@
     SkCanvas canvas(device, proxy->surfaceProps(), SkCanvas::kDefault_InitFlags);
 
     canvas.translate(-SkIntToScalar(deviceBounds.fLeft), -SkIntToScalar(deviceBounds.fTop));
     canvas.concat(ctx.ctm());
     SkPaint paint;
     paint.setFilterLevel(fFilterLevel);
     canvas.drawBitmap(localDevice.get()->accessBitmap(false), SkIntToScalar(localIBounds.fLeft),
                       SkIntToScalar(localIBounds.fTop), &paint);
     //canvas.drawPicture(fPicture);
 }
+
+#ifndef SK_IGNORE_TO_STRING
+void SkPictureImageFilter::toString(SkString* str) const {
+    str->appendf("SkPictureImageFilter: (");
+    str->appendf("crop: (%f,%f,%f,%f) ", 
+                 fCropRect.fLeft, fCropRect.fTop, fCropRect.fRight, fCropRect.fBottom);
+    if (fPicture) {
+        str->appendf("picture: (%f,%f,%f,%f)",
+                     fPicture->cullRect().fLeft, fPicture->cullRect().fTop,
+                     fPicture->cullRect().fRight, fPicture->cullRect().fBottom);
+    }
+    str->append(")");
+}
+#endif