V8ScriptValueSerializer: Use PartitionAlloc for the buffer, and avoid copying it into a String.

third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp

Index: third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp
index 9c45b714f853d1c5e25fabb94259ccb87109fb60..efbea512af30df75084538e0da90e533a6c1d602 100644
--- a/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/serialization/V8ScriptValueSerializer.cpp
@@ -19,6 +19,7 @@
 #include "public/platform/WebBlobInfo.h"
 #include "wtf/AutoReset.h"
 #include "wtf/DateMath.h"
+#include "wtf/allocator/Partitions.h"
 #include "wtf/text/StringUTF8Adaptor.h"
 
 namespace blink {
@@ -63,13 +64,9 @@ RefPtr<SerializedScriptValue> V8ScriptValueSerializer::serialize(
     return nullptr;
 
   // Finalize the results.
-  std::vector<uint8_t> buffer = m_serializer.ReleaseBuffer();
-  // Currently, the output must be padded to a multiple of two bytes.
-  // TODO(jbroman): Remove this old conversion to WTF::String.
-  if (buffer.size() % 2)
-    buffer.push_back(0);
+  std::pair<uint8_t*, size_t> buffer = m_serializer.Release();
   m_serializedScriptValue->setData(
-      String(reinterpret_cast<const UChar*>(&buffer[0]), buffer.size() / 2));
+      SerializedScriptValue::DataBufferPtr(buffer.first), buffer.second);
   return std::move(m_serializedScriptValue);
 }
 
@@ -372,4 +369,16 @@ v8::Maybe<bool> V8ScriptValueSerializer::WriteHostObject(
   return v8::Nothing<bool>();
 }
 
+void* V8ScriptValueSerializer::ReallocateBufferMemory(void* oldBuffer,
+                                                      size_t size,
+                                                      size_t* actualSize) {
+  *actualSize = WTF::Partitions::bufferActualSize(size);
+  return WTF::Partitions::bufferRealloc(oldBuffer, size,
+                                        "SerializedScriptValue buffer");
+}
+
+void V8ScriptValueSerializer::FreeBufferMemory(void* buffer) {
+  return WTF::Partitions::bufferFree(buffer);
+}
+
 }  // namespace blink