Speculative revert to diagnose crash in chrome. Revert "Add SkCachedData and use it for SkMipMap"

tests/CachedDataTest.cpp

-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkCachedData.h"
-#include "SkDiscardableMemoryPool.h"
-#include "Test.h"
-
-enum LockedState {
-    kUnlocked,
-    kLocked,
-};
-
-enum CachedState {
-    kNotInCache,
-    kInCache,
-};
-
-static void check_data(skiatest::Reporter* reporter, SkCachedData* data,
-                       int refcnt, CachedState cacheState, LockedState lockedState) {
-    REPORTER_ASSERT(reporter, data->testing_only_getRefCnt() == refcnt);
-    REPORTER_ASSERT(reporter, data->testing_only_isInCache() == (kInCache == cacheState));
-    REPORTER_ASSERT(reporter, data->testing_only_isLocked() == (lockedState == kLocked));
-}
-
-static SkCachedData* make_data(size_t size, SkDiscardableMemoryPool* pool) {
-    if (pool) {
-        SkDiscardableMemory* dm = pool->create(size);
-        // the pool "can" return null, but it shouldn't in these controlled conditions
-        SK_ALWAYSBREAK(dm);
-        return SkNEW_ARGS(SkCachedData, (size, dm));
-    } else {
-        return SkNEW_ARGS(SkCachedData, (sk_malloc_throw(size), size));
-    }
-}
-
-// returns with the data locked by client and cache
-static SkCachedData* test_locking(skiatest::Reporter* reporter,
-                                  size_t size, SkDiscardableMemoryPool* pool) {
-    SkCachedData* data = make_data(size, pool);
-    
-    memset(data->writable_data(), 0x80, size);  // just to use writable_data()
-
-    check_data(reporter, data, 1, kNotInCache, kLocked);
-    
-    data->ref();
-    check_data(reporter, data, 2, kNotInCache, kLocked);
-    data->unref();
-    check_data(reporter, data, 1, kNotInCache, kLocked);
-    
-    data->attachToCacheAndRef();
-    check_data(reporter, data, 2, kInCache, kLocked);
-    
-    data->unref();
-    check_data(reporter, data, 1, kInCache, kUnlocked);
-    
-    data->ref();
-    check_data(reporter, data, 2, kInCache, kLocked);
-
-    return data;
-}
-
-/*
- *  SkCachedData behaves differently (regarding its locked/unlocked state) depending on
- *  when it is in the cache or not. Being in the cache is signaled by calling attachToCacheAndRef()
- *  instead of ref(). (and balanced by detachFromCacheAndUnref).
- *
- *  Thus, among other things, we test the end-of-life behavior when the client is the last owner
- *  and when the cache is.
- */
-DEF_TEST(CachedData, reporter) {
-    SkAutoTUnref<SkDiscardableMemoryPool> pool(SkDiscardableMemoryPool::Create(1000));
-
-    for (int useDiscardable = 0; useDiscardable <= 1; ++useDiscardable) {
-        const size_t size = 100;
-
-        // test with client as last owner
-        SkCachedData* data = test_locking(reporter, size, useDiscardable ? pool.get() : NULL);
-        check_data(reporter, data, 2, kInCache, kLocked);
-        data->detachFromCacheAndUnref();
-        check_data(reporter, data, 1, kNotInCache, kLocked);
-        data->unref();
-
-        // test with cache as last owner
-        data = test_locking(reporter, size, useDiscardable ? pool.get() : NULL);
-        check_data(reporter, data, 2, kInCache, kLocked);
-        data->unref();
-        check_data(reporter, data, 1, kInCache, kUnlocked);
-        data->detachFromCacheAndUnref();
-    }
-}
-