Simplify flattening to just write enough to call the factory

src/core/SkFlattenable.cpp

-
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "SkFlattenable.h"
 #include "SkPtrRecorder.h"
+#include "SkReadBuffer.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
-void SkFlattenable::flatten(SkWriteBuffer&) const
-{
-    /*  we don't write anything at the moment, but this allows our subclasses
-        to not know that, since we want them to always call INHERITED::flatten()
-        in their code.
-    */
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+bool SkFlattenable::NeedsDeepUnflatten(const SkReadBuffer& buffer) {
+    return buffer.isVersionLT(SkReadBuffer::kFlattenCreateProc_Version);
 }
+#endif
+
+void SkFlattenable::flatten(SkWriteBuffer&) const {}
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkNamedFactorySet::SkNamedFactorySet() : fNextAddedFactory(0) {}
 
 uint32_t SkNamedFactorySet::find(SkFlattenable::Factory factory) {
     uint32_t index = fFactorySet.find(factory);
     if (index > 0) {
         return index;
     }
@@ skipping 106 matching lines @@
     report_no_entries(__FUNCTION__);
 #endif
     const Entry* entries = gEntries;
     for (int i = gCount - 1; i >= 0; --i) {
         if (entries[i].fFactory == fact) {
             return entries[i].fName;
         }
     }
     return NULL;
 }