Add Panel::SetPanelBoundsInstantly for all platforms.

chrome/browser/ui/panels/panel_browser_window_cocoa.mm

Index: chrome/browser/ui/panels/panel_browser_window_cocoa.mm
diff --git a/chrome/browser/ui/panels/panel_browser_window_cocoa.mm b/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
index 64a9224b6b91c83c3ede9b80d9f15a5bef249576..7a1f57e9d48cc06d5b295fc4b2b696267b7e2897 100644
--- a/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
+++ b/chrome/browser/ui/panels/panel_browser_window_cocoa.mm
@@ -102,14 +102,15 @@ gfx::Rect PanelBrowserWindowCocoa::GetPanelBounds() const {
 
 // |bounds| is the platform-independent screen coordinates, with (0,0) at
 // top-left of the primary screen.
-void PanelBrowserWindowCocoa::SetPanelBounds(const gfx::Rect& bounds) {
+void PanelBrowserWindowCocoa::SetPanelBounds(const gfx::Rect& bounds,
+                                             bool animate) {
   if (bounds_ == bounds)
     return;
 
   bounds_ = bounds;
 
   NSRect frame = ConvertCoordinatesToCocoa(bounds);
-  [controller_ setPanelFrame:frame];
+  [controller_ setPanelFrame:frame animate:animate];
 }
 
 void PanelBrowserWindowCocoa::ClosePanel() {