Avoid heap allocations in IPAddress

content/public/common/common_param_traits.cc

Index: content/public/common/common_param_traits.cc
diff --git a/content/public/common/common_param_traits.cc b/content/public/common/common_param_traits.cc
index 286e6621cc6212cf727ba636c44d4df4a0ba6ceb..38e1fdc64565892510c85af0f81b7105698d6064 100644
--- a/content/public/common/common_param_traits.cc
+++ b/content/public/common/common_param_traits.cc
@@ -124,22 +124,29 @@ void ParamTraits<net::IPEndPoint>::Log(const param_type& p, std::string* l) {
 
 void ParamTraits<net::IPAddress>::GetSize(base::PickleSizer* s,
                                           const param_type& p) {
-  GetParamSize(s, p.bytes());
+  // TODO(rch): avoid creating a vector here.
+  base::StackVector<uint8_t, 16> bytes;
+  for (uint8_t byte : p.bytes())
+    bytes->push_back(byte);
+  GetParamSize(s, bytes);
 }
 
 void ParamTraits<net::IPAddress>::Write(base::Pickle* m, const param_type& p) {
-  WriteParam(m, p.bytes());
+  // TODO(rch): avoid creating a vector here.
+  base::StackVector<uint8_t, 16> bytes;
+  for (uint8_t byte : p.bytes())
+    bytes->push_back(byte);
+  WriteParam(m, bytes);
 }
 
 bool ParamTraits<net::IPAddress>::Read(const base::Pickle* m,
                                        base::PickleIterator* iter,
                                        param_type* p) {
-  std::vector<uint8_t> bytes;
+  base::StackVector<uint8_t, 16> bytes;
   if (!ReadParam(m, iter, &bytes))
     return false;
-  if (bytes.size() &&
-      bytes.size() != net::IPAddress::kIPv4AddressSize &&
-      bytes.size() != net::IPAddress::kIPv6AddressSize) {
+  if (bytes->size() && bytes->size() != net::IPAddress::kIPv4AddressSize &&
+      bytes->size() != net::IPAddress::kIPv6AddressSize) {
     return false;
   }
   *p = net::IPAddress(bytes);