Image filters: change applyCropRect() to take a src rect.

src/effects/SkOffsetImageFilter.cpp

Index: src/effects/SkOffsetImageFilter.cpp
diff --git a/src/effects/SkOffsetImageFilter.cpp b/src/effects/SkOffsetImageFilter.cpp
index 70247f2a190cf31bd894051c6c325cc0a8bb22ce..2aac4f32d10dec1bd078317fac30cee1d59039aa 100644
--- a/src/effects/SkOffsetImageFilter.cpp
+++ b/src/effects/SkOffsetImageFilter.cpp
@@ -37,7 +37,9 @@ bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
         }
 
         SkIRect bounds;
-        if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) {
+        SkIRect srcBounds = src.bounds();
+        srcBounds.offset(srcOffset);
+        if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
             return false;
         }