[tracing] Add graphics memory dump provider for Android

components/tracing/graphics_memory_dump_provider_android.h

+// 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 COMPONENTS_TRACING_GRAPHICS_MEMORY_DUMP_PROVIDER_ANDROID_H_
+#define COMPONENTS_TRACING_GRAPHICS_MEMORY_DUMP_PROVIDER_ANDROID_H_
+
+#include <string>
+
+#include "base/containers/hash_tables.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/singleton.h"
+#include "base/trace_event/memory_dump_provider.h"
+#include "components/tracing/tracing_export.h"
+
+namespace tracing {
+
+// Dump provider which collects memory stats about graphics memory on Android.
+// This requires the presence of the memtrack_helper daemon, which must be
+// executed separetely via a (root) adb shell command. The dump provider will
+// fail (and hence disabled by the MemoryDumpManager) in absence of the helper.
+// See the design-doc https://goo.gl/4Y30p9 for more details.
+class TRACING_EXPORT GraphicsMemoryDumpProvider
+    : public base::trace_event::MemoryDumpProvider {
+ public:
+  static GraphicsMemoryDumpProvider* GetInstance();
+
+  // MemoryDumpProvider implementation.
+  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
+                    base::trace_event::ProcessMemoryDump* pmd) override;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(GraphicsMemoryDumpProviderTest, ParseResponse);

[Robert Sesek, 2015/10/13 22:38:39]

Where's the test?

[Primiano Tucci (use gerrit), 2015/10/14 08:44:34]

Oh, this line should really be moved to crrev.com/1396313002, the cl introducing
the test.
Why not putting the test here? that CL needs some gyp reshuffling, hence my guts
say that it is going to and be reverted because ... gyp is gyp and non trivial
gyp changes break stuff.
Removed from here.

+  friend struct base::DefaultSingletonTraits<GraphicsMemoryDumpProvider>;
+
+  void ParseResponseAndAddToDump(const char* buf,
+                                 size_t length,
+                                 base::trace_event::ProcessMemoryDump* pmd);
+
+  GraphicsMemoryDumpProvider();
+  ~GraphicsMemoryDumpProvider() override;
+
+  static const char kDumpBaseName[];  // Used by the unittest.
+
+  // Stores key names coming from the memtrack helper in long-lived storage.
+  // This is to allow using cheap char* strings in tracing without copies.
+  base::hash_set<std::string> key_names_;
+
+  DISALLOW_COPY_AND_ASSIGN(GraphicsMemoryDumpProvider);
+};
+
+}  // namespace tracing
+
+#endif  // COMPONENTS_TRACING_GRAPHICS_MEMORY_DUMP_PROVIDER_ANDROID_H_