Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkColorFilterImageFilter.cpp

Index: src/effects/SkColorFilterImageFilter.cpp
diff --git a/src/effects/SkColorFilterImageFilter.cpp b/src/effects/SkColorFilterImageFilter.cpp
index 10976d77f0db790c50de8ca3daa0c731ee6e33b6..012f1329a44c552d0f33529ba63d9739ecc5b9e5 100755
--- a/src/effects/SkColorFilterImageFilter.cpp
+++ b/src/effects/SkColorFilterImageFilter.cpp
@@ -84,6 +84,21 @@
     : INHERITED(1, &input, cropRect, uniqueID), fColorFilter(SkRef(cf)) {
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkColorFilterImageFilter::SkColorFilterImageFilter(SkReadBuffer& buffer) : INHERITED(1, buffer) {
+    fColorFilter = buffer.readColorFilter();
+    // we aren't prepared for this to be NULL, and it can't ever be when we're NOT supporting
+    // SK_SUPPORT_LEGACY_DEEPFLATTENING, as we always go through a factory which can detect
+    // NULL. However, since here we're in the legacy code, we assign a dummy filter so we
+    // don't crash with a null-ptr.
+    if (NULL == fColorFilter) {
+        // colormatrix identity is effectively a no-op
+        fColorFilter = SkColorMatrixFilter::Create(SkColorMatrix());
+        SkASSERT(fColorFilter);
+    }
+}
+#endif
+
 SkFlattenable* SkColorFilterImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkAutoTUnref<SkColorFilter> cf(buffer.readColorFilter());