Make panel adjust bounds per preferred size change notification on Windows.

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
===================================================================
--- chrome/browser/ui/browser_window.h	(revision 94932)
+++ chrome/browser/ui/browser_window.h	(working copy)
@@ -33,6 +33,7 @@
 
 namespace gfx {
 class Rect;
+class Size;
 }
 
 class Extension;
@@ -333,6 +334,9 @@
   virtual void ShowKeyboardOverlay(gfx::NativeWindow owning_window) = 0;
 #endif
 
+  // Invoked when the preferred size of the contents has been changed.

[Dmitry Titov, 2011/08/05 19:02:20]

Could you note here in what coord system the size is and what it is the size of?

[jianli, 2011/08/09 19:56:16]

Since it is about size, I do not think we need to mention coord system. I added
more detail about what size is about.

+  virtual void UpdatePreferredSize(const gfx::Size& pref_size) {}
+
   // Construct a BrowserWindow implementation for the specified |browser|.
   static BrowserWindow* CreateBrowserWindow(Browser* browser);