[Experimental] CSSSerializer Proof-of-concept

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

Index: third_party/WebKit/Source/core/css/StyleSheetContents.cpp
diff --git a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
index a29c1cc394709908380ffd419c1f4f54b27eca78..4f78f6cce45dd07b57ca8c68b7d79f52bd321d51 100644
--- a/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
+++ b/third_party/WebKit/Source/core/css/StyleSheetContents.cpp
@@ -26,6 +26,8 @@
 #include "core/css/StyleRuleImport.h"
 #include "core/css/StyleRuleNamespace.h"
 #include "core/css/parser/CSSParser.h"
+#include "core/css/serializer/CSSDeserializeStream.h"
+#include "core/css/serializer/CSSSerializeStream.h"
 #include "core/dom/Document.h"
 #include "core/dom/Node.h"
 #include "core/dom/StyleEngine.h"
@@ -123,8 +125,11 @@ bool StyleSheetContents::isCacheable() const
     // differently depending on the context of the parent CSSStyleSheet (e.g.
     // if they are in differently sized iframes). Once RuleSets are media query
     // agnostic, we can restore sharing of StyleSheetContents with medea queries.
-    if (m_hasMediaQueries)
-        return false;
+    CSDEBUG("hasMediaQueries: %d, m_importRules not empty %d, m_ownerRule %d\n",
+        m_hasMediaQueries, !m_importRules.isEmpty(), (bool)m_ownerRule);
+    CSDEBUG("loaderr: %d, mutable: %d, css h invalid: %d\n", m_didLoadErrorOccur, m_isMutable, !m_hasSyntacticallyValidCSSHeader);
+    //if (m_hasMediaQueries)
+    //    return false;
     // FIXME: Support copying import rules.
     if (!m_importRules.isEmpty())
         return false;
@@ -143,6 +148,26 @@ bool StyleSheetContents::isCacheable() const
     return true;
 }
 
+void StyleSheetContents::deserialize(CSSDeserializeStream* stream)
+{
+    CSDEBUG("StyleSheetContents::deserialize\n");
+
+    unsigned numChildRules = stream->readUnsigned();
+    for (unsigned i = 0; i < numChildRules; ++i) {
+        parserAppendRule(StyleRuleBase::deserialize(stream));
+    }
+}
+
+void StyleSheetContents::serialize(CSSSerializeStream* stream)
+{
+    CSDEBUG("StyleSheetContents::serialize isCacheable: %d\n", isCacheable());
+
+    stream->writeUnsigned(m_childRules.size());
+    for (auto childRule : m_childRules) {
+        childRule->serialize(stream);
+    }
+}
+
 void StyleSheetContents::parserAppendRule(PassRefPtrWillBeRawPtr<StyleRuleBase> rule)
 {
     if (rule->isImportRule()) {