Handle resize corner layout entirely in the platform BrowserWindow*/BrowserView* code...

chrome/browser/ui/views/tab_contents/tab_contents_container.h

Index: chrome/browser/ui/views/tab_contents/tab_contents_container.h
===================================================================
--- chrome/browser/ui/views/tab_contents/tab_contents_container.h	(revision 65756)
+++ chrome/browser/ui/views/tab_contents/tab_contents_container.h	(working copy)
@@ -13,11 +13,25 @@
 
 class NativeTabContentsContainer;
 class RenderViewHost;
+class RenderWidgetHostView;
 class TabContents;
 
 class TabContentsContainer : public views::View,
                              public NotificationObserver {
  public:
+  // Interface to request the reserved contents area updates.
+  class ReservedAreaDelegate {
+   public:
+    // Notifies that |source|'s reserved contents area should be updated.
+    // Reserved contents area is a rect in tab contents view coordinates where
+    // contents should not be rendered (to display the resize corner, sidebar
+    // mini tabs or any other UI elements overlaying this container).
+    virtual void UpdateReservedContentsRect(
+        const TabContentsContainer* source) = 0;
+   protected:
+    virtual ~ReservedAreaDelegate() {}
+  };
+
   TabContentsContainer();
   virtual ~TabContentsContainer();
 
@@ -36,6 +50,10 @@
   // so performance is better.
   void SetFastResize(bool fast_resize);
 
+  void set_reserved_area_delegate(ReservedAreaDelegate* delegate) {
+    reserved_area_delegate_ = delegate;
+  }
+
   // Overridden from NotificationObserver:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
@@ -65,6 +83,10 @@
   // get notified.
   void TabContentsDestroyed(TabContents* contents);
 
+  // Called when the RenderWidgetHostView of the hosted TabContents has changed.
+  void RenderWidgetHostViewChanged(RenderWidgetHostView* old_view,
+                                   RenderWidgetHostView* new_view);
+
   // An instance of a NativeTabContentsContainer object that holds the native
   // view handle associated with the attached TabContents.
   NativeTabContentsContainer* native_container_;
@@ -75,6 +97,9 @@
   // Handles registering for our notifications.
   NotificationRegistrar registrar_;
 
+  // Delegate for enquiring reserved contents area. Not owned by us.
+  ReservedAreaDelegate* reserved_area_delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(TabContentsContainer);
 };