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

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
===================================================================
--- chrome/browser/ui/panels/panel_manager.h	(revision 98900)
+++ chrome/browser/ui/panels/panel_manager.h	(working copy)
@@ -45,6 +45,11 @@
   void Drag(int delta_x);
   void EndDragging(bool cancelled);
 
+  // Invoked when the preferred window size of the given panel might need to
+  // get changed.
+  void OnPreferredWindowSizeChanged(
+      Panel* panel, const gfx::Size& preferred_window_size);
+
   // Returns true if we should bring up the titlebars, given the current mouse
   // point.
   bool ShouldBringUpTitlebars(int mouse_x, int mouse_y) const;
@@ -74,6 +79,10 @@
     auto_hiding_desktop_bar_ = auto_hiding_desktop_bar;
   }
 
+  void enable_auto_sizing(bool enabled) {
+    auto_sizing_enabled_ = enabled;
+  }
+
   void SetWorkAreaForTesting(const gfx::Rect& work_area) {
     SetWorkArea(work_area);
   }
@@ -128,8 +137,14 @@
   // Does the real job of bringing up or down the titlebars.
   void DoBringUpOrDownTitlebars(bool bring_up);
 
+  int GetMaxPanelWidth() const;
+  int GetMaxPanelHeight() const;
   int GetRightMostAvaialblePosition() const;
 
+  // Updates the maximum size of each panel as the result of adding, removing,
+  // or sizing panels.
+  void UpdateMaxSizeForAllPanels();
+
   Panels panels_;
 
   // Stores the panels that are pending to remove. We want to delay the removal
@@ -164,6 +179,11 @@
 
   ScopedRunnableMethodFactory<PanelManager> method_factory_;
 
+  // Whether or not bounds will be updated when the preferred content size is
+  // changed. The testing code could set this flag to false so that other tests
+  // will not be affected.
+  bool auto_sizing_enabled_;
+
   static const int kPanelsHorizontalSpacing = 4;
 
   DISALLOW_COPY_AND_ASSIGN(PanelManager);