Start from scratch on a faster SkFlatDictionary.

src/core/SkOrderedWriteBuffer.h

Index: src/core/SkOrderedWriteBuffer.h
diff --git a/src/core/SkOrderedWriteBuffer.h b/src/core/SkOrderedWriteBuffer.h
index ebec7d1c213c46ce90169031256dbe8ee9fe910b..d4efba0c790ef91ace29c8aa76856c6d71ea796a 100644
--- a/src/core/SkOrderedWriteBuffer.h
+++ b/src/core/SkOrderedWriteBuffer.h
@@ -26,14 +26,18 @@ class SkRefCntSet;
 class SkOrderedWriteBuffer : public SkFlattenableWriteBuffer {
 public:
     SkOrderedWriteBuffer(size_t minSize);
-    SkOrderedWriteBuffer(size_t minSize, void* initialStorage,
-                         size_t storageSize);
+    SkOrderedWriteBuffer(size_t minSize, void* initialStorage, size_t storageSize);
     virtual ~SkOrderedWriteBuffer();
 
     virtual bool isOrderedBinaryBuffer() SK_OVERRIDE { return true; }
     virtual SkOrderedWriteBuffer* getOrderedBinaryBuffer() SK_OVERRIDE { return this; }
 
     SkWriter32* getWriter32() { return &fWriter; }
+    void reset(void* storage, size_t storageSize) { fWriter.reset(storage, storageSize); }
+
+    // Returns true if we've written only into the storage passed into constructor or reset.
+    // (You may be able to use this to avoid a call to writeToMemory.)
+    bool wroteOnlyToStorage() const { return fWriter.wroteOnlyToStorage(); }
 
     void writeToMemory(void* dst) { fWriter.flatten(dst); }
     uint32_t* reserve(size_t size) { return fWriter.reserve(size); }