Avoid divide by zero when animating panel bounds.

chrome/browser/ui/panels/panel_bounds_animation.cc

Index: chrome/browser/ui/panels/panel_bounds_animation.cc
diff --git a/chrome/browser/ui/panels/panel_bounds_animation.cc b/chrome/browser/ui/panels/panel_bounds_animation.cc
index cdf5c5abf913c48ffc97a84d6aa987ccd2025654..79af324c9dc0f7141d2a2d3a91dea5863aef42f0 100644
--- a/chrome/browser/ui/panels/panel_bounds_animation.cc
+++ b/chrome/browser/ui/panels/panel_bounds_animation.cc
@@ -29,7 +29,8 @@ PanelBoundsAnimation::PanelBoundsAnimation(ui::AnimationDelegate* target,
   // Initialize animation differently in this case, using fast-pause-slow
   // method, see below for more details.
   int duration = kSetBoundsAnimationMs;
-  if (panel_->expansion_state() == Panel::MINIMIZED) {
+  if (initial_bounds.height() > final_bounds.height() &&
+      panel_->expansion_state() == Panel::MINIMIZED) {
     double hidden_title_height =
         panel_->TitleOnlyHeight() - final_bounds.height();
     double distance_y = initial_bounds.height() - final_bounds.height();