[WeakMemoryCache 1a] Make Reference from Inspector to Resource weak, remove removedFromMemoryCache()

third_party/WebKit/Source/core/css/CSSStyleSheetResourceTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/fetch/CSSStyleSheetResource.h"
 
 #include "core/css/CSSCrossfadeValue.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSProperty.h"
 #include "core/css/CSSSelectorList.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParserMode.h"
 #include "core/css/parser/CSSParserSelector.h"
 #include "core/dom/Document.h"
 #include "core/fetch/FetchContext.h"
 #include "core/fetch/FetchInitiatorTypeNames.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/heap/Handle.h"
+#include "platform/heap/Heap.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/testing/URLTestHelpers.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLResponse.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/WTFString.h"
 
@@ skipping 91 matching lines @@
 
     Resource* imageResource = ImageResource::create(ResourceRequest(imageURL));
     ASSERT_TRUE(imageResource);
     memoryCache()->add(imageResource);
     ASSERT_TRUE(memoryCache()->contains(imageResource));
 
     CSSStyleSheetResource* cssResource = CSSStyleSheetResource::createForTest(ResourceRequest(cssURL), "utf-8");
     cssResource->responseReceived(ResourceResponse(cssURL, "style/css", 0, nullAtom, String()), nullptr);
     cssResource->finish();
 
-    StyleSheetContents* contents = StyleSheetContents::create(CSSParserContext(HTMLStandardMode, nullptr));
+    Persistent<StyleSheetContents> contents = StyleSheetContents::create(CSSParserContext(HTMLStandardMode, nullptr));
     CSSStyleSheet* sheet = CSSStyleSheet::create(contents, document());
     EXPECT_TRUE(sheet);
 
     contents->checkLoaded();
     cssResource->saveParsedStyleSheet(contents);
+    ASSERT_TRUE(contents->isReferencedFromResource());
 
     // Verify that the cache will have a mapping for |imageResource| at |url|.
-    // The underlying |contents| for the stylesheet resource must have a
-    // matching cache status.
     ASSERT_TRUE(memoryCache()->contains(imageResource));
     ASSERT_FALSE(memoryCache()->contains(cssResource));
-    ASSERT_FALSE(contents->isInMemoryCache());
+
+    // Destruct |*cssResource|.
+    cssResource = nullptr;
+    ThreadHeap::collectAllGarbage();
+
+    // The underlying |contents| for the stylesheet resource must have a
+    // matching reference status.
+    ASSERT_FALSE(contents->isReferencedFromResource());
 }
 
 } // namespace
 } // namespace blink