The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e61c75b5abf6e7234b26f10bb0d493bb32fea073

commit e61c75b5abf6e7234b26f10bb0d493bb32fea073
Author: sky <sky@chromium.org>
Date: Thu Apr 07 03:13:12 2016

Fixes problems with drawn state

There were two problems with how the drawn state was previously
communicated:
. the drawn state included the visibility of the window. This meant
  that if a window was hidden it's drawn state was also false, so that
  when the visibility was made true the client didn't know that it
  should make the drawn state true as well.
. the drawn state was communicated for all windows, when really all that
  matters is the drawn state of the root windows.

To fix this I changed the following:
. the drawn state is communicated via OnEmbed or OnTopLevelCreated().
. the drawn state is the drawn state of the windows parent, not the
  window. This way it doesn't included the visibility of the
  window. This fixes the problem I mentioned above so that when a
  client changes the visibility it doesn't impact the drawn state.
. NewTopLevelWindow() sets drawn to true (which is generally what the
  wm will do). This way focus requests won't silently fail in the client.

BUG= 600868 
TEST=covered by tests
R=ben@chromium.org

Review URL: https://codereview.chromium.org/1864113002

Cr-Commit-Position: refs/heads/master@{#385641}

[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/lib/window.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/lib/window_private.h
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/lib/window_tree_client_impl.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/lib/window_tree_client_impl.h
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/tests/window_tree_client_impl_unittest.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/tests/window_unittest.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/cpp/window.h
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/public/interfaces/window_tree.mojom
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/test_change_tracker.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/test_change_tracker.h
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/test_utils.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/test_utils.h
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/window_tree.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/window_tree_client_unittest.cc
[modify] https://crrev.com/e61c75b5abf6e7234b26f10bb0d493bb32fea073/components/mus/ws/window_tree_unittest.cc

Bulk verified