Simplify flattening to just write enough to call the factory

src/core/SkDraw.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 "SkDraw.h"
 #include "SkBlitter.h"
 #include "SkCanvas.h"
@@ skipping 2001 matching lines @@
         virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
 
     private:
         SkMatrix    fDstToUnit;
         SkPMColor   fColors[3];
 
         typedef SkShader::Context INHERITED;
     };
 
     SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTriColorShader)
+    SK_DECLARE_NOT_FLATTENABLE_PROCS(SkTriColorShader)
 
 protected:
-    SkTriColorShader(SkReadBuffer& buffer) : SkShader(buffer) {}
-
     virtual Context* onCreateContext(const ContextRec& rec, void* storage) const SK_OVERRIDE {
         return SkNEW_PLACEMENT_ARGS(storage, TriColorShaderContext, (*this, rec));
     }
 
 private:
     typedef SkShader INHERITED;
 };
 
 bool SkTriColorShader::TriColorShaderContext::setup(const SkPoint pts[], const SkColor colors[],
                                                     int index0, int index1, int index2) {
@@ skipping 338 matching lines @@
         mask->fImage = SkMask::AllocImage(size);
         memset(mask->fImage, 0, mask->computeImageSize());
     }
 
     if (SkMask::kJustComputeBounds_CreateMode != mode) {
         draw_into_mask(*mask, devPath, style);
     }
 
     return true;
 }