Simplify flattening to just write enough to call the factory

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 121 matching lines @@
 }
 
 static SkShader::TileMode unpack_mode(uint32_t packed) {
     return (SkShader::TileMode)(packed & 0xF);
 }
 
 static uint32_t unpack_flags(uint32_t packed) {
     return packed >> 4;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkGradientShaderBase::SkGradientShaderBase(SkReadBuffer& buffer) : INHERITED(buffer) {
     if (buffer.isVersionLT(SkReadBuffer::kNoUnitMappers_Version)) {
         // skip the old SkUnitMapper slot
         buffer.skipFlattenable();
     }
 
     int colorCount = fColorCount = buffer.getArrayCount();
     if (colorCount > kColorStorageCount) {
         size_t allocSize = (sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec)) * colorCount;
         if (buffer.validateAvailable(allocSize)) {
@@ skipping 18 matching lines @@
         Rec* recs = fRecs;
         recs[0].fPos = 0;
         for (int i = 1; i < colorCount; i++) {
             recs[i].fPos = buffer.readInt();
             recs[i].fScale = buffer.readUInt();
         }
     }
     buffer.readMatrix(&fPtsToUnit);
     this->initCommon();
 }
+#endif
 
 SkGradientShaderBase::~SkGradientShaderBase() {
     if (fOrigColors != fStorage) {
         sk_free(fOrigColors);
     }
 }
 
 void SkGradientShaderBase::initCommon() {
     unsigned colorAlpha = 0xFF;
     for (int i = 0; i < fColorCount; i++) {
@@ skipping 958 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif