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 7861ef0fe145dc7e7359ce5d4361150283fa8aec..0a8abea04e37aba951c95135eef6a63019f20635 100644
--- a/tests/PDFPrimitivesTest.cpp
+++ b/tests/PDFPrimitivesTest.cpp
@@ -317,11 +317,12 @@ 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()