Add most of ProcessReader and its test

util/stdlib/pointer_container.h

Index: util/stdlib/pointer_container.h
diff --git a/util/stdlib/pointer_container.h b/util/stdlib/pointer_container.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_STDLIB_POINTER_CONTAINER_H_
+#define CRASHPAD_UTIL_STDLIB_POINTER_CONTAINER_H_
+
+#include <vector>
+
+#include "base/stl_util.h"
+
+namespace crashpad {
+
+// PointerContainer allows an STL container such as std::vector<> to “own”
+// pointer elements stored in it. When the container is destroyed, “delete” will
+// be called on its pointer elements.
+template <typename ContainerType>
+class PointerContainer : public ContainerType {
+ public:
+  PointerContainer() : ContainerType(), pointer_deleter_(this) {}
+
+  ~PointerContainer() {}
+
+ private:
+  STLElementDeleter<ContainerType> pointer_deleter_;
+};
+
+template <typename T>
+class PointerVector : public PointerContainer<std::vector<T*> > {};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_STDLIB_POINTER_CONTAINER_H_