Simplify flattening to just write enough to call the factory

src/effects/gradients/SkLinearGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkLinearGradient.h"
 
 static inline int repeat_bits(int x, const int bits) {
@@ skipping 42 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc)
     : SkGradientShaderBase(desc)
     , fStart(pts[0])
     , fEnd(pts[1])
 {
     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;
+    if (!desc.unflatten(buffer)) {
+        return NULL;
+    }
+    SkPoint pts[2];
+    pts[0] = buffer.readPoint();
+    pts[1] = buffer.readPoint();
+    return SkGradientShader::CreateLinear(pts, desc.fColors, desc.fPos, desc.fCount,
+                                          desc.fTileMode, desc.fGradFlags, desc.fLocalMatrix);
+}
 
 void SkLinearGradient::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writePoint(fStart);
     buffer.writePoint(fEnd);
 }
 
 size_t SkLinearGradient::contextSize() const {
     return sizeof(LinearGradientContext);
 }
@@ skipping 514 matching lines @@
     str->append("SkLinearGradient (");
 
     str->appendf("start: (%f, %f)", fStart.fX, fStart.fY);
     str->appendf(" end: (%f, %f) ", fEnd.fX, fEnd.fY);
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif