Fix painting issue with maximize button in aura.

Fix invalid transition in custom_button.cc When the mouse is released on a custom button, the state is set to BS_NORMAL if the hit test fails.
The following two transitions should have the same final effect.
BS_PRESSED -> BS_HOT -> BS_NORMAL
BS_PRESSED -> BS_NORMAL

Review URL: http://codereview.chromium.org/8437003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@108671 0039d316-1c4b-4281-b951-d872f2087c98

views/controls/button/custom_button.cc

@@ -34,7 +34,8 @@ void CustomButton::SetState(ButtonState state) {
     if (state_ == BS_NORMAL && state == BS_HOT) {
       // Button is hovered from a normal state, start hover animation.
       hover_animation_->Show();
-    } else if (state_ == BS_HOT && state == BS_NORMAL) {
+    } else if ((state_ == BS_HOT || state_ == BS_PUSHED)
+          && state == BS_NORMAL) {
       // Button is returning to a normal state from hover, start hover
       // fade animation.
       hover_animation_->Hide();