4x allocation in PipeController is probably overkill.

src/pipe/utils/SamplePipeControllers.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 "SamplePipeControllers.h"
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkGPipe.h"
 #include "SkMatrix.h"
 
 PipeController::PipeController(SkCanvas* target, SkPicture::InstallPixelRefProc proc)
-:fReader(target) {
-    fBlock = NULL;
-    fBlockSize = fBytesWritten = 0;
+    : fReader(target), fBlockSize(0), fBytesWritten(0) {
     fReader.setBitmapDecoder(proc);
 }
 
-PipeController::~PipeController() {
-    sk_free(fBlock);
-}
-
-void* PipeController::requestBlock(size_t minRequest, size_t *actual) {
-    sk_free(fBlock);
-    fBlockSize = minRequest * 4;
-    fBlock = sk_malloc_throw(fBlockSize);
+void* PipeController::requestBlock(size_t minRequest, size_t* actual) {
+    fBlockSize = minRequest;
+    fBlock.reset(fBlockSize);
     fBytesWritten = 0;
     *actual = fBlockSize;
-    return fBlock;
+    return fBlock.get();
 }
 
 void PipeController::notifyWritten(size_t bytes) {
     fStatus = fReader.playback(this->getData(), bytes);
     SkASSERT(SkGPipeReader::kError_Status != fStatus);
     fBytesWritten += bytes;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ skipping 66 matching lines @@
 void ThreadSafePipeController::draw(SkCanvas* target) {
     SkGPipeReader reader(target);
     for (int currentBlock = 0; currentBlock < fBlockList.count(); currentBlock++ ) {
         reader.playback(fBlockList[currentBlock].fBlock, fBlockList[currentBlock].fBytes);
     }
 
     if (fBlock) {
         reader.playback(fBlock, fBytesWritten);
     }
 }