Add SkBBoxHierarchy::reserve() as an optional size hint.

tests/PictureTest.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 "SkBBoxHierarchy.h"
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
@@ skipping 1851 matching lines @@
 
 struct CountingBBH : public SkBBoxHierarchy {
     mutable int searchCalls;
 
     CountingBBH() : searchCalls(0) {}
 
     virtual void search(const SkRect& query, SkTDArray<unsigned>* results) const SK_OVERRIDE {
         this->searchCalls++;
     }
 
-    // All other methods unimplemented.
     virtual void insert(unsigned opIndex, const SkRect& bounds, bool defer) SK_OVERRIDE {}
-    virtual void flushDeferredInserts() SK_OVERRIDE {}
 };
 
 class SpoonFedBBHFactory : public SkBBHFactory {
 public:
     explicit SpoonFedBBHFactory(SkBBoxHierarchy* bbh) : fBBH(bbh) {}
     virtual SkBBoxHierarchy* operator()(int width, int height) const {
         return SkRef(fBBH);
     }
 private:
     SkBBoxHierarchy* fBBH;
@@ skipping 37 matching lines @@
 
     // The picture shares the immutable pixels but copies the mutable ones.
     REPORTER_ASSERT(r, mut.pixelRef()->unique());
     REPORTER_ASSERT(r, !immut.pixelRef()->unique());
 
     // When the picture goes away, it's just our bitmaps holding the refs.
     pic.reset(NULL);
     REPORTER_ASSERT(r, mut.pixelRef()->unique());
     REPORTER_ASSERT(r, immut.pixelRef()->unique());
 }