Add ScopedKeepAlive to c/b/lifetime

chrome/browser/lifetime/keep_alive_options.h

Index: chrome/browser/lifetime/keep_alive_options.h
diff --git a/chrome/browser/lifetime/keep_alive_options.h b/chrome/browser/lifetime/keep_alive_options.h
new file mode 100644
index 0000000000000000000000000000000000000000..7be9de3663e8679571d2be1dc3770d4b09844c1f
--- /dev/null
+++ b/chrome/browser/lifetime/keep_alive_options.h
@@ -0,0 +1,20 @@
+// 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.
+
+#ifndef CHROME_BROWSER_LIFETIME_KEEP_ALIVE_OPTIONS_H_
+#define CHROME_BROWSER_LIFETIME_KEEP_ALIVE_OPTIONS_H_
+
+struct KeepAliveOptions {
+  // Should be descriptive of what the KeepAlive's lifetime is tied to, to help
+  // with debugging.
+  const char label[32];

[Bernhard Bauer, 2016/02/22 18:19:38]

I think const char* should work here; no need to artificially limit the size of
the label (and then have to worry about what would happen if someone were to use
a longer label...).

[dgn, 2016/02/22 19:07:19]

Thanks, done. If it's longer the compiler would detect it and show an error.

+
+  // TODO(dgn)
+  // When registering a token, indictations of which kind of optimizations would

[Bernhard Bauer, 2016/02/22 18:19:38]

Nit: "indications".

Also, the passive voice is used a bit too much in this sentence. Maybe just,
"[...] we should add [...]"

[dgn, 2016/02/22 19:07:19]

Done.

+  // be allowed during the KeepAlive's lifetime should be provided. This allows
+  // to take some liberties with the state of the browser to optimize
+  // the resource consumption.
+};
+
+#endif  // CHROME_BROWSER_LIFETIME_KEEP_ALIVE_OPTIONS_H_