Make TracedValue lower overhead.

base/pickle.h

Index: base/pickle.h
diff --git a/base/pickle.h b/base/pickle.h
index 3de2886e5d4c742e79e8d870922027c1dda44e1d..77339772a6451d5b1a0688eca3cb44bc1510963f 100644
--- a/base/pickle.h
+++ b/base/pickle.h
@@ -34,6 +34,7 @@ class BASE_EXPORT PickleIterator {
   bool ReadUInt32(uint32* result) WARN_UNUSED_RESULT;
   bool ReadInt64(int64* result) WARN_UNUSED_RESULT;
   bool ReadUInt64(uint64* result) WARN_UNUSED_RESULT;
+  bool ReadUIntPtr(uintptr_t* result) WARN_UNUSED_RESULT;
   bool ReadFloat(float* result) WARN_UNUSED_RESULT;
   bool ReadString(std::string* result) WARN_UNUSED_RESULT;
   bool ReadWString(std::wstring* result) WARN_UNUSED_RESULT;
@@ -159,6 +160,9 @@ class BASE_EXPORT Pickle {
   bool ReadUInt64(PickleIterator* iter, uint64* result) const {
     return iter->ReadUInt64(result);
   }
+  bool ReadUIntPtr(PickleIterator* iter, uintptr_t* result) const {
+    return iter->ReadUIntPtr(result);
+  }
   bool ReadFloat(PickleIterator* iter, float* result) const {
     return iter->ReadFloat(result);
   }
@@ -222,6 +226,9 @@ class BASE_EXPORT Pickle {
   bool WriteUInt64(uint64 value) {
     return WriteBytes(&value, sizeof(value));
   }
+  bool WriteUIntPtr(uintptr_t value) {
+    return WriteBytes(&value, sizeof(value));
+  }
   bool WriteFloat(float value) {
     return WriteBytes(&value, sizeof(value));
   }