Add a WinHeap dump provider to the memory profiler.

base/trace_event/winheap_dump_provider.h

Index: base/trace_event/winheap_dump_provider.h
diff --git a/base/trace_event/winheap_dump_provider.h b/base/trace_event/winheap_dump_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..29e9323e40347625206749285ac71c0cdb3d063d
--- /dev/null
+++ b/base/trace_event/winheap_dump_provider.h
@@ -0,0 +1,56 @@
+// 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_H_
+#define BASE_TRACE_EVENT_WINHEAP_DUMP_PROVIDER_H_
+
+#include <istream>

[Primiano Tucci (use gerrit), 2015/04/22 23:48:32]

out of curiosity, what do you need istream for in the header here?

[Sébastien Marchand, 2015/04/23 10:52:03]

It's a leftover from one of my experiments :), removed.

+#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;
+
+ protected:
+  // Retrieves the information about given heap. The |heap_info| should contain

[Primiano Tucci (use gerrit), 2015/04/22 23:48:32]

Should this friend the test class?

[Sébastien Marchand, 2015/04/23 10:52:03]

Done.

+  // 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);
+
+  // Exposed as protected for unittesting purposes.
+  WinHeapDumpProvider() { }
+  ~WinHeapDumpProvider() override { }
+
+ private:
+  friend struct DefaultSingletonTraits<WinHeapDumpProvider>;
+
+  DISALLOW_COPY_AND_ASSIGN(WinHeapDumpProvider);
+};
+
+}  // namespace trace_event
+}  // namespace base
+
+#endif  // BASE_TRACE_EVENT_WINHEAP_DUMP_PROVIDER_H_