Revert of Revert of Fix SkTileImageFilter clipping/cropRect interaction issue

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index 7233ec670698d1ebacc80dc95d664bb38e4cd40e..f63d1bf13ba0f6562f1b7e2fb117c3b3a5cf8595 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -32,6 +32,37 @@
   enum { kDefaultCacheSize = 128 * 1024 * 1024 };
 #endif 
 
+#ifndef SK_IGNORE_TO_STRING
+void SkImageFilter::CropRect::toString(SkString* str) const {
+    if (!fFlags) {
+        return;
+    }
+
+    str->appendf("cropRect (");
+    if (fFlags & CropRect::kHasLeft_CropEdge) {
+        str->appendf("%.2f, ", fRect.fLeft);
+    } else {
+        str->appendf("X, ");
+    }
+    if (fFlags & CropRect::kHasTop_CropEdge) {
+        str->appendf("%.2f, ", fRect.fTop);
+    } else {
+        str->appendf("X, ");
+    }
+    if (fFlags & CropRect::kHasRight_CropEdge) {
+        str->appendf("%.2f, ", fRect.fRight);
+    } else {
+        str->appendf("X, ");
+    }
+    if (fFlags & CropRect::kHasBottom_CropEdge) {
+        str->appendf("%.2f", fRect.fBottom);
+    } else {
+        str->appendf("X");
+    }
+    str->appendf(") ");
+}
+#endif
+
 static int32_t next_image_filter_unique_id() {
     static int32_t gImageFilterUniqueID;