Purge SkPurgeableMemoryBlock.

src/ports/SkPurgeableMemoryBlock_none.cpp

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkPurgeableMemoryBlock.h"
-
-bool SkPurgeableMemoryBlock::IsSupported() {
-    return false;
-}
-
-#ifdef SK_DEBUG
-bool SkPurgeableMemoryBlock::PlatformSupportsPurgingAllUnpinnedBlocks() {
-    return false;
-}
-
-bool SkPurgeableMemoryBlock::PurgeAllUnpinnedBlocks() {
-    return false;
-}
-
-bool SkPurgeableMemoryBlock::purge() {
-    return false;
-}
-#endif
-
-SkPurgeableMemoryBlock::SkPurgeableMemoryBlock(size_t size) {
-    SkASSERT(false);
-}
-
-SkPurgeableMemoryBlock::~SkPurgeableMemoryBlock() {
-}
-
-void* SkPurgeableMemoryBlock::pin(SkPurgeableMemoryBlock::PinResult*) {
-    return NULL;
-}
-
-void SkPurgeableMemoryBlock::unpin() {
-}