WIP: Introduce CompressibleString

third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp b/third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp
index 5dc1eb2eaaabab6a37058e59000353c2e0f1ab11..478e8b59784fb40520277a349f827b8879f0f607 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8StringResource.cpp
@@ -39,7 +39,7 @@ template<class StringClass> struct StringTraits {
 
 template<>
 struct StringTraits<String> {
-    static const String& fromStringResource(WebCoreStringResourceBase* resource)
+    static String fromStringResource(WebCoreStringResourceBase* resource)
     {
         return resource->webcoreString();
     }
@@ -49,7 +49,7 @@ struct StringTraits<String> {
 
 template<>
 struct StringTraits<AtomicString> {
-    static const AtomicString& fromStringResource(WebCoreStringResourceBase* resource)
+    static AtomicString fromStringResource(WebCoreStringResourceBase* resource)
     {
         return resource->atomicString();
     }
@@ -108,10 +108,17 @@ StringType v8StringToWebCoreString(v8::Local<v8::String> v8String, ExternalMode
         v8::String::ExternalStringResourceBase* resource = v8String->GetExternalStringResourceBase(&encoding);
         if (LIKELY(!!resource)) {
             WebCoreStringResourceBase* base;
-            if (encoding == v8::String::ONE_BYTE_ENCODING)
-                base = static_cast<WebCoreStringResource8*>(resource);
-            else
-                base = static_cast<WebCoreStringResource16*>(resource);
+            if (UNLIKELY(resource->isCompressible())) {
+                if (encoding == v8::String::ONE_BYTE_ENCODING)
+                    base = static_cast<WebCoreCompressibleStringResource8*>(resource);
+                else
+                    base = static_cast<WebCoreCompressibleStringResource16*>(resource);
+            } else {
+                if (encoding == v8::String::ONE_BYTE_ENCODING)
+                    base = static_cast<WebCoreStringResource8*>(resource);
+                else
+                    base = static_cast<WebCoreStringResource16*>(resource);
+            }
             return StringTraits<StringType>::fromStringResource(base);
         }
     }