Move SkComposeImageFilter into its own {.h, .cpp} files

src/effects/SkTestImageFilters.cpp

Index: src/effects/SkTestImageFilters.cpp
diff --git a/src/effects/SkTestImageFilters.cpp b/src/effects/SkTestImageFilters.cpp
index 9af61c8cbfca251f3a19a07fdcdbc3d99400ed66..a919dedd415e8be011e58c00caf58640de5d8197 100755
--- a/src/effects/SkTestImageFilters.cpp
+++ b/src/effects/SkTestImageFilters.cpp
@@ -20,54 +20,6 @@ public:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkComposeImageFilter::~SkComposeImageFilter() {
-}
-
-bool SkComposeImageFilter::onFilterImage(Proxy* proxy,
-                                         const SkBitmap& src,
-                                         const SkMatrix& ctm,
-                                         SkBitmap* result,
-                                         SkIPoint* loc) {
-    SkImageFilter* outer = getInput(0);
-    SkImageFilter* inner = getInput(1);
-
-    if (!outer && !inner) {
-        return false;
-    }
-
-    if (!outer || !inner) {
-        return (outer ? outer : inner)->filterImage(proxy, src, ctm, result, loc);
-    }
-
-    SkBitmap tmp;
-    return inner->filterImage(proxy, src, ctm, &tmp, loc) &&
-           outer->filterImage(proxy, tmp, ctm, result, loc);
-}
-
-bool SkComposeImageFilter::onFilterBounds(const SkIRect& src,
-                                          const SkMatrix& ctm,
-                                          SkIRect* dst) {
-    SkImageFilter* outer = getInput(0);
-    SkImageFilter* inner = getInput(1);
-
-    if (!outer && !inner) {
-        return false;
-    }
-
-    if (!outer || !inner) {
-        return (outer ? outer : inner)->filterBounds(src, ctm, dst);
-    }
-
-    SkIRect tmp;
-    return inner->filterBounds(src, ctm, &tmp) &&
-           outer->filterBounds(tmp, ctm, dst);
-}
-
-SkComposeImageFilter::SkComposeImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
 bool SkDownSampleImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                             const SkMatrix&,
                                             SkBitmap* result, SkIPoint*) {