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

src/effects/SkColorFilterImageFilter.cpp

Index: src/effects/SkColorFilterImageFilter.cpp
diff --git a/src/effects/SkColorFilterImageFilter.cpp b/src/effects/SkColorFilterImageFilter.cpp
index b0e47505a7399f6ed7b1aacec5f80ca17abfd305..5b97d1bc362f8447c4e0d67ae39a2fae34ec1418 100644
--- a/src/effects/SkColorFilterImageFilter.cpp
+++ b/src/effects/SkColorFilterImageFilter.cpp
@@ -66,7 +66,9 @@ bool SkColorFilterImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& sourc
     }
 
     SkIRect bounds;
-    if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) {
+    SkIRect srcBounds = src.bounds();
+    srcBounds.offset(srcOffset);
+    if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
         return false;
     }