[Experimental] CSSSerializer Proof-of-concept

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

Index: third_party/WebKit/Source/core/css/StylePropertySet.cpp
diff --git a/third_party/WebKit/Source/core/css/StylePropertySet.cpp b/third_party/WebKit/Source/core/css/StylePropertySet.cpp
index 04da3ec817a457dbd5b40ff50f6c7899b34ec82f..6f3381334eafa841b915ed3b129ca006568ed33e 100644
--- a/third_party/WebKit/Source/core/css/StylePropertySet.cpp
+++ b/third_party/WebKit/Source/core/css/StylePropertySet.cpp
@@ -29,6 +29,8 @@
 #include "core/css/StylePropertySerializer.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParser.h"
+#include "core/css/serializer/CSSDeserializeStream.h"
+#include "core/css/serializer/CSSSerializeStream.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/text/StringBuilder.h"
@@ -56,6 +58,21 @@ PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::cre
     return adoptRefWillBeNoop(new (slot) ImmutableStylePropertySet(properties, count, cssParserMode));
 }
 
+PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::deserialize(CSSDeserializeStream* stream)
+{
+    unsigned count = stream->readUnsigned();
+    CSSParserMode cssParserMode = HTMLStandardMode; // FIXME!!!
+    CSDEBUG("ImmutableStylePropertySet::deserialize count: %u\n", count);
+
+    ASSERT(count <= MaxArraySize);
+#if ENABLE(OILPAN)
+    void* slot = Heap::allocate<StylePropertySet>(sizeForImmutableStylePropertySetWithPropertyCount(count));
+#else
+    void* slot = WTF::Partitions::fastMalloc(sizeForImmutableStylePropertySetWithPropertyCount(count), "blink::ImmutableStylePropertySet");
+#endif // ENABLE(OILPAN)
+    return adoptRefWillBeNoop(new (slot) ImmutableStylePropertySet(stream, count, cssParserMode));
+}
+
 PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> StylePropertySet::immutableCopyIfNeeded() const
 {
     if (!isMutable())
@@ -91,6 +108,22 @@ ImmutableStylePropertySet::ImmutableStylePropertySet(const CSSProperty* properti
     }
 }
 
+ImmutableStylePropertySet::ImmutableStylePropertySet(CSSDeserializeStream* stream, unsigned length, CSSParserMode cssParserMode)
+    : StylePropertySet(cssParserMode, length)
+{
+    StylePropertyMetadata* metadataArray = const_cast<StylePropertyMetadata*>(this->metadataArray());
+    RawPtrWillBeMember<CSSValue>* valueArray = const_cast<RawPtrWillBeMember<CSSValue>*>(this->valueArray());
+    for (unsigned i = 0; i < m_arraySize; ++i) {
+        metadataArray[i] = stream->readStylePropertyMetadata();
+    }
+    for (unsigned i = 0; i < m_arraySize; ++i) {
+        valueArray[i] = CSSValue::deserialize(stream).leakRef();
+#if !ENABLE(OILPAN)
+        valueArray[i]->ref(); // FIXME: maybe not needed as above "leaks"
+#endif
+    }
+}
+
 ImmutableStylePropertySet::~ImmutableStylePropertySet()
 {
 #if !ENABLE(OILPAN)
@@ -145,6 +178,23 @@ int ImmutableStylePropertySet::findPropertyIndex(T property) const
 template CORE_EXPORT int ImmutableStylePropertySet::findPropertyIndex(CSSPropertyID) const;
 template CORE_EXPORT int ImmutableStylePropertySet::findPropertyIndex(AtomicString) const;
 
+void ImmutableStylePropertySet::serializeAfterDispatch(CSSSerializeStream* stream) const
+{
+    // FIXME: handle CSSParserMode
+    stream->writeUnsigned(m_arraySize);
+    CSDEBUG("ImmutableStylePropertySet::serializeAfterDispatch count: %u\n", m_arraySize);
+
+    auto metadatas = metadataArray();
+    for (unsigned i = 0; i < m_arraySize; i++) {
+        stream->writeStylePropertyMetadata(metadatas[i]);
+    }
+
+    const RawPtrWillBeMember<CSSValue>* values = valueArray();
+    for (unsigned i = 0; i < m_arraySize; i++) {
+        values[i]->serialize(stream);
+    }
+}
+
 DEFINE_TRACE_AFTER_DISPATCH(ImmutableStylePropertySet)
 {
     const RawPtrWillBeMember<CSSValue>* values = valueArray();
@@ -561,6 +611,14 @@ DEFINE_TRACE_AFTER_DISPATCH(MutableStylePropertySet)
     StylePropertySet::traceAfterDispatch(visitor);
 }
 
+void StylePropertySet::serialize(CSSSerializeStream* stream) const
+{
+    CSDEBUG("StylePropertySet::serialize\n");
+
+    ASSERT(!m_isMutable);
+    toImmutableStylePropertySet(this)->serializeAfterDispatch(stream);
+}
+
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.