Revert of Remove SK_SUPPORT_LEGACY_DEEPFLATTENING.

src/effects/gradients/SkLinearGradient.cpp

Index: src/effects/gradients/SkLinearGradient.cpp
diff --git a/src/effects/gradients/SkLinearGradient.cpp b/src/effects/gradients/SkLinearGradient.cpp
index 1faca5e4a1f2adec0488b3c2229e0103d35f8849..3ab721950a6cf485d08e63a50a46b7ddd3f8efbf 100644
--- a/src/effects/gradients/SkLinearGradient.cpp
+++ b/src/effects/gradients/SkLinearGradient.cpp
@@ -59,6 +59,14 @@
 {
     pts_to_unit_matrix(pts, &fPtsToUnit);
 }
+
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkLinearGradient::SkLinearGradient(SkReadBuffer& buffer)
+    : INHERITED(buffer)
+    , fStart(buffer.readPoint())
+    , fEnd(buffer.readPoint()) {
+}
+#endif
 
 SkFlattenable* SkLinearGradient::CreateProc(SkReadBuffer& buffer) {
     DescriptorScope desc;
@@ -560,7 +568,7 @@
                                            const SkMatrix* localMatrix, GrColor* paintColor,
                                            GrFragmentProcessor** fp)  const {
     SkASSERT(context);
-
+    
     SkMatrix matrix;
     if (!this->getLocalMatrix().invert(&matrix)) {
         return false;
@@ -573,10 +581,10 @@
         matrix.postConcat(inv);
     }
     matrix.postConcat(fPtsToUnit);
-
+    
     *paintColor = SkColor2GrColorJustAlpha(paint.getColor());
     *fp = GrLinearGradient::Create(context, *this, matrix, fTileMode);
-
+    
     return true;
 }