Reland of https://codereview.chromium.org/1087133005/ (Add a WinHeap dump provider to the memory pr…

base/trace_event/winheap_dump_provider_win.h

Index: base/trace_event/winheap_dump_provider_win.h
diff --git a/base/trace_event/winheap_dump_provider_win.h b/base/trace_event/winheap_dump_provider_win.h
new file mode 100644
index 0000000000000000000000000000000000000000..8abac47efce08bd44b3101632b8ef03faa47a67c
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+++ b/base/trace_event/winheap_dump_provider_win.h
@@ -0,0 +1,53 @@
+// 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.
+
+#ifndef BASE_TRACE_EVENT_WINHEAP_DUMP_PROVIDER_WIN_H_
+#define BASE_TRACE_EVENT_WINHEAP_DUMP_PROVIDER_WIN_H_
+
+#include <set>
+
+#include "base/memory/singleton.h"
+#include "base/trace_event/memory_dump_provider.h"
+
+namespace base {
+namespace trace_event {
+
+// A structure containing some information about a given heap.
+struct WinHeapInfo {
+  HANDLE heap_id;
+  size_t committed_size;
+  size_t allocated_size;
+  size_t block_count;
+};
+
+// Dump provider which collects process-wide heap memory stats. This provider
+// iterates over all the heaps of the current process to gather some metrics
+// about them.
+class BASE_EXPORT WinHeapDumpProvider : public MemoryDumpProvider {
+ public:
+  static WinHeapDumpProvider* GetInstance();
+
+  // MemoryDumpProvider implementation.
+  bool DumpInto(ProcessMemoryDump* pmd) override;
+  const char* GetFriendlyName() const override;
+
+ private:
+  friend struct DefaultSingletonTraits<WinHeapDumpProvider>;
+
+  // Retrieves the information about given heap. The |heap_info| should contain
+  // a valid handle to an existing heap. The blocks contained in the
+  // |block_to_skip| set will be ignored.
+  bool GetHeapInformation(WinHeapInfo* heap_info,
+                          const std::set<void*>& block_to_skip);
+
+  WinHeapDumpProvider() {}
+  ~WinHeapDumpProvider() override {}
+
+  DISALLOW_COPY_AND_ASSIGN(WinHeapDumpProvider);
+};
+
+}  // namespace trace_event
+}  // namespace base
+
+#endif  // BASE_TRACE_EVENT_WINHEAP_DUMP_PROVIDER_WIN_H_