Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/Sk1DPathEffect.cpp

Index: src/effects/Sk1DPathEffect.cpp
diff --git a/src/effects/Sk1DPathEffect.cpp b/src/effects/Sk1DPathEffect.cpp
index 83f684e2ca2bc29b901d1434a2062e37bc16f5ca..47824fd0f2eac09c0ef8079d42b1ea6cf1fc8cf0 100644
--- a/src/effects/Sk1DPathEffect.cpp
+++ b/src/effects/Sk1DPathEffect.cpp
@@ -147,6 +147,22 @@
     }
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkPath1DPathEffect::SkPath1DPathEffect(SkReadBuffer& buffer) {
+    fAdvance = buffer.readScalar();
+    if (fAdvance > 0) {
+        buffer.readPath(&fPath);
+        fInitialOffset = buffer.readScalar();
+        fStyle = (Style) buffer.readUInt();
+    } else {
+        SkDEBUGF(("SkPath1DPathEffect can't use advance <= 0\n"));
+        // Make Coverity happy.
+        fInitialOffset = 0;
+        fStyle = kStyleCount;
+    }
+}
+#endif
+
 SkScalar SkPath1DPathEffect::begin(SkScalar contourLength) const {
     return fInitialOffset;
 }