Fix boot timeout and reduce boot time

Since the notification shade has been separated from status bar
to another window where the keyguard resides. It won't be visible
until KeyguardViewMediator receives system ready.

By making the visibility of notification shade consistent with the
initial state of keyguard when attaching the window, window manager
won't miss to wait for it. That avoids dismissing boot animation
too early. The windows of notification shade and wallpaper can also
be drawn earlier, that reduces the total waiting time of drawn
windows by about 50~100ms on a mid-end device.

The logic of wait-for-visible-not-drawn-window is restored to be
the same as Q. The isVisible considers the independent visibility
of wallpaper and visibility of the insets client. The isDrawnLw
accepts READY_TO_SHOW so even keyguard decides not to use wallpaper,
the procedure won't wait until timeout.

Bug: 160271169
Bug: 158144185
Bug: 157746100
Bug: 157281833
Test: atest DisplayContentTests# \
      testShouldWaitForSystemDecorWindowsOnBoot_OnDefaultDisplay
      NotificationShadeWindowControllerTest#attach_visibleWithWallpaper
Test: Boot with enable/disable keyguard/wallpaper, there is no timeout
      and black screen or flickering.

Change-Id: I2f979055e89ae5e40af05e469741bb89e2e24ce6
Merged-In: I2f979055e89ae5e40af05e469741bb89e2e24ce6