Serialize/Deserialize support in HistogramBase

base/metrics/histogram_base.cc

Index: base/metrics/histogram_base.cc
diff --git a/base/metrics/histogram_base.cc b/base/metrics/histogram_base.cc
index bcfb57feb231ce7be9b31bbf4eb34b0e8b441b0d..2854fd4d0fb15d473b41b5f2d61c86fc788f1e53 100644
--- a/base/metrics/histogram_base.cc
+++ b/base/metrics/histogram_base.cc
@@ -9,6 +9,10 @@
 #include "base/logging.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_samples.h"
+#include "base/metrics/sparse_histogram.h"
+#include "base/pickle.h"
 #include "base/values.h"
 
 namespace base {
@@ -39,6 +43,28 @@ HistogramBase::HistogramBase(const std::string& name)
 
 HistogramBase::~HistogramBase() {}
 
+// static
+HistogramBase* HistogramBase::DeserializeHistogramInfo(PickleIterator* iter) {
+  int type;
+  if (!iter->ReadInt(&type))
+    return NULL;
+
+  switch (type) {
+    case HISTOGRAM:
+      return Histogram::DeserializeHistogramInfo(iter);
+    case LINEAR_HISTOGRAM:
+      return LinearHistogram::DeserializeHistogramInfo(iter);
+    case BOOLEAN_HISTOGRAM:
+      return BooleanHistogram::DeserializeHistogramInfo(iter);
+    case CUSTOM_HISTOGRAM:
+      return CustomHistogram::DeserializeHistogramInfo(iter);
+    case SPARSE_HISTOGRAM:
+      return SparseHistogram::DeserializeHistogramInfo(iter);
+    default:
+      return NULL;
+  }
+}
+
 void HistogramBase::SetFlags(int32 flags) {
   flags_ |= flags;
 }
@@ -47,6 +73,12 @@ void HistogramBase::ClearFlags(int32 flags) {
   flags_ &= ~flags;
 }
 
+bool HistogramBase::SerializeInfo(Pickle* pickle) const {
+  if (!pickle->WriteInt(GetHistogramType()))
+    return false;
+  return SerializeInfoImpl(pickle);
+}
+
 void HistogramBase::WriteJSON(std::string* output) const {
   Count count;
   scoped_ptr<ListValue> buckets(new ListValue());