Changes how we detect whether the launcher should be shown when

Changes how we detect whether the launcher should be shown when
auto-hidden to use an EventFilter as well as whether the status area
is showing a bubble. The old code didn't work right because the status
is a separate widget, meaning a mouse exit always gets dispatched.

I'm also fixing a bug in LayerAnimator. Getting the target value was
only looking at the running animation state, not the queued
animations. This was causing confusion because the workspace
animations queue up a couple of animations.

BUG=119296
TEST=see bug, covered by tests too.
R=ben@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=128162

[Ben Goodger (Google), 2012-03-22 00:55:10]

lgtm

[Ben Goodger (Google), 2012-03-22 00:55:30]

lgtm

lgtm