Define crash keys in the directory hierarchy where they are used.

media/base/crash_keys.cc

Index: media/base/crash_keys.cc
diff --git a/media/base/crash_keys.cc b/media/base/crash_keys.cc
new file mode 100644
index 0000000000000000000000000000000000000000..254eeeb1646d42f60ab8ab77d414b5c0fde59576
--- /dev/null
+++ b/media/base/crash_keys.cc
@@ -0,0 +1,35 @@
+// Copyright 2016 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.
+
+#include "media/base/crash_keys.h"
+
+#include <vector>
+
+#include "base/debug/crash_logging.h"
+#include "base/logging.h"
+#include "build/build_config.h"
+#include "components/crash/core/common/crash_keys.h"
+
+namespace crash_keys {
+
+#if defined(OS_WIN)
+const char kHungAudioThreadDetails[] = "hung-audio-thread-details";
+#endif
+
+const char kZeroEncodeDetails[] = "zero-encode-details";
+
+void AppendMediaCrashKeys(std::vector<base::debug::CrashKey>* keys) {
+  DCHECK(keys);
+
+  const std::vector<base::debug::CrashKey> media_keys = {
+#if defined(OS_WIN)
+    {kHungAudioThreadDetails, kSmallSize},
+#endif
+    {kZeroEncodeDetails, kSmallSize},
+  };
+
+  keys->insert(keys->end(), media_keys.begin(), media_keys.end());
+}
+
+}  // namespace crash_keys