components/metrics: Add runtime memory leak detector

components/metrics/leak_detector/leak_detector_value_type.cc

Index: components/metrics/leak_detector/leak_detector_value_type.cc
diff --git a/components/metrics/leak_detector/leak_detector_value_type.cc b/components/metrics/leak_detector/leak_detector_value_type.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fbf29d1905f269f220ebe9ea9ff2314ba1a93435
--- /dev/null
+++ b/components/metrics/leak_detector/leak_detector_value_type.cc
@@ -0,0 +1,69 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/metrics/leak_detector/leak_detector_value_type.h"
+
+#include <stdio.h>
+
+namespace leak_detector {
+
+const char* LeakDetectorValueType::GetTypeName() const {
+  switch (type_) {
+  case kSize:
+    return "size";
+  case kCallStack:
+    return "call stack";
+  default:
+    return "(none)";
+  }
+}
+
+const char* LeakDetectorValueType::ToString(char* buffer,

[jar (doing other things), 2015/08/21 02:48:43]

Please put the mutable target last.

[Simon Que, 2015/08/21 21:59:20]

Done.

+                                            size_t buffer_size) const {
+  switch (type_) {
+  case kSize:
+    snprintf(buffer, buffer_size, "%u", size_);
+    break;
+  case kCallStack:
+    snprintf(buffer, buffer_size, "%p", call_stack_);
+    break;
+  default:
+    snprintf(buffer, buffer_size, "(none)");
+    break;
+  }
+
+  return buffer;
+}
+
+bool LeakDetectorValueType::operator== (
+    const LeakDetectorValueType& other) const {
+  if (type_ != other.type_)
+    return false;
+
+  switch(type_) {
+  case kSize:
+    return size_ == other.size_;
+  case kCallStack:
+    return call_stack_ == other.call_stack_;
+  default:
+    return false;
+  }
+}
+
+bool LeakDetectorValueType::operator< (
+    const LeakDetectorValueType& other) const {
+  if (type_ < other.type_)
+    return true;
+
+  switch(type_) {
+  case kSize:
+    return size_ < other.size_;
+  case kCallStack:
+    return call_stack_ < other.call_stack_;
+  default:
+    return false;
+  }
+}
+
+}  // leak_detector