[WIP] Exposing memory-infra to Skia.

include/utils/SkMemoryDumpManager.h

+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkMemoryDumpManager_DEFINED
+#define SkMemoryDumpManager_DEFINED
+
+#include "SkMemoryAllocatorDump.h"
+#include "SkString.h"
+#include "SkTypes.h"
+
+class SkMemoryDumpProvider;
+class SkProcessMemoryDump;
+
+class SK_API SkMemoryDumpManager {

[ssid, 2015/07/29 18:30:50]

These can be made singleton to remove dummy definitions of the functions.

+ public:
+  // SkMemoryDumpManager does NOT take memory ownership of |mdp|, which is
+  // expected to either be a singleton or unregister itself.
+  // The SkMemoryDumpProvider::onMemoryDump
+  // method will be called on the same thread that called the
+  // registerMemoryDumpProvider() method.
+  static void RegisterDumpProvider(SkMemoryDumpProvider* mdp);
+
+  // Must be called on the thread that called registerMemoryDumpProvider().
+  static void UnregisterMemoryDumpProvider(SkMemoryDumpProvider*);
+
+  // Returns a newly allocated WebProcessMemoryDump instance.
+  static SkProcessMemoryDump* CreateProcessMemoryDump();
+
+  // Returns guid corresponding to the given string (the hash value) for
+  // creating a WebMemoryAllocatorDump.
+  static SkMemoryAllocatorDumpGuid CreateWebMemoryAllocatorDumpGuid(
+      const SkString& guidStr);
+
+  // Returns a unique id for the current process. The id can be retrieved only
+  // by child processes and only when tracing is enabled. This is intended to
+  // express cross-process sharing of memory dumps on the child-process side,
+  // without having to know its own child process id.
+  static uint64_t GetTracingProcessId();
+};
+
+#endif  // SkMemoryDumpManager_DEFINED