Adding StringPiece read/write support to pickle.

base/pickle.cc

Index: base/pickle.cc
diff --git a/base/pickle.cc b/base/pickle.cc
index d461f413dfd2e68a6e97c9f15d5d97dc68faacb3..c8ed7814811b08742af722490f3af29bf4cce187 100644
--- a/base/pickle.cc
+++ b/base/pickle.cc
@@ -152,6 +152,18 @@ bool PickleIterator::ReadString(std::string* result) {
   return true;
 }
 
+bool PickleIterator::ReadStringPiece(base::StringPiece* result) {
+  int len;
+  if (!ReadInt(&len))
+    return false;
+  const char* read_from = GetReadPointerAndAdvance(len);
+  if (!read_from)
+    return false;
+
+  *result = base::StringPiece(read_from, len);
+  return true;
+}
+
 bool PickleIterator::ReadWString(std::wstring* result) {
   int len;
   if (!ReadInt(&len))
@@ -271,7 +283,8 @@ Pickle& Pickle::operator=(const Pickle& other) {
   return *this;
 }
 
-bool Pickle::WriteString(const std::string& value) {
+bool Pickle::WriteString(const base::StringPiece& value)
+{
   if (!WriteInt(static_cast<int>(value.size())))
     return false;