Make filters use SkImage instead of SkBitmap

tests/PDFPrimitivesTest.cpp

Index: tests/PDFPrimitivesTest.cpp
diff --git a/tests/PDFPrimitivesTest.cpp b/tests/PDFPrimitivesTest.cpp
index 97ad25e09a167f48276f9cabd3a633d2bb787c04..0defbd348fae510550d4b98288745ee4b8554974 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -321,11 +321,12 @@ class DummyImageFilter : public SkImageFilter {
 public:
     DummyImageFilter(bool visited = false) : SkImageFilter(0, NULL), fVisited(visited) {}
     ~DummyImageFilter() SK_OVERRIDE {}
-    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
-                               SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
+    virtual bool onFilterImage(Proxy*, const SkImage* src, const Context&,
+                               SkAutoTUnref<const SkImage>& result,
+                               SkIPoint* offset) const SK_OVERRIDE {
         fVisited = true;
         offset->fX = offset->fY = 0;
-        *result = src;
+        result.reset(SkRef(src));
         return true;
     }
     SK_TO_STRING_OVERRIDE()