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This is a reland of https://crrev.com/c/1297474.

This change adds functionality to support lock screen notifications for
Android. The wake lock module now listens to dark resume notifications
from the power manager. It -

1. Starts a timer to check for partial wake locks acquired by Android.

2. After the timer in 1 expires, if no partial wake lock is acquired the
power manager is requested to re-suspend the system. If a partial wake
lock is acquired, then another hard timeout timer is set and also an
observer to wake lock release is set.

3. If wake lock is released, the system is re-suspended immediately.

4. If a wake lock is still acquired but the hard timeout expires then
the system is re-suspended immediately.

5. If the system transitions to a full resume all dark resume related
state and timers are cleared.

On top of this change -

1. Changes were added to fix linker errors by declaring static constants
in the source file as well.

2. Refactored some functions in the test code.

BUG=chromium:898297
TEST=Unit tests and end to end test with Android applications.

Change-Id: I573f130fad2ed092d8acb83fb3319614b4ce8e02
Reviewed-on: https://chromium-review.googlesource.com/c/1302866Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Abhishek Bhardwaj <abhishekbh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603264}