Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/SkDashPathEffect.cpp

Index: src/effects/SkDashPathEffect.cpp
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index f866ea074e4592871302eecbddb050ba8b3e9279..f31d883c8ec3d11f39f495ba86c7c36a688a0fa3 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -369,3 +369,28 @@
     }
     return NULL;
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkDashPathEffect::SkDashPathEffect(SkReadBuffer& buffer)
+        : INHERITED(buffer)
+        , fPhase(0)
+        , fInitialDashLength(0)
+        , fInitialDashIndex(0)
+        , fIntervalLength(0) {
+    fPhase = buffer.readScalar();
+    fCount = buffer.getArrayCount();
+    size_t allocSize = sizeof(SkScalar) * fCount;
+    if (buffer.validateAvailable(allocSize)) {
+        fIntervals = (SkScalar*)sk_malloc_throw(allocSize);
+        buffer.readScalarArray(fIntervals, fCount);
+    } else {
+        fIntervals = NULL;
+    }
+
+    // set the internal data members, fPhase should have been between 0 and intervalLength
+    // when written to buffer so no need to adjust it
+    SkDashPath::CalcDashParameters(fPhase, fIntervals, fCount,
+                                   &fInitialDashLength, &fInitialDashIndex, &fIntervalLength);
+}
+#endif
+