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

chrome/browser/cocoa/tab_contents_controller.h

Index: chrome/browser/cocoa/tab_contents_controller.h
===================================================================
--- chrome/browser/cocoa/tab_contents_controller.h	(revision 66034)
+++ chrome/browser/cocoa/tab_contents_controller.h	(working copy)
@@ -8,9 +8,23 @@
 
 #include <Cocoa/Cocoa.h>
 
+#include "base/scoped_ptr.h"
+
 class TabContents;
+class TabContentsNotificationBridge;
+@class TabContentsController;
 
-// A class that controls the web contents of a tab. It manages displaying the
+// The interface for the tab contents view controller's delegate.
+
+@protocol TabContentsControllerDelegate
+
+// Tells the delegate when the tab contents view's frame is about to change.
+- (void)tabContentsViewFrameWillChange:(TabContentsController*)source
+                             frameRect:(NSRect)frameRect;
+
+@end
+
+// A class that controls the TabContents view. It manages displaying the
 // native view for a given TabContents.
 // Note that just creating the class does not display the view. We defer
 // inserting it until the box is the correct size to avoid multiple resize
@@ -20,12 +34,28 @@
 @interface TabContentsController : NSViewController {
  @private
   TabContents* contents_;  // weak
+  // Delegate to be notified about size changes.
+  id<TabContentsControllerDelegate> delegate_;  // weak
+  scoped_ptr<TabContentsNotificationBridge> tabContentsBridge_;
 }
 @property(readonly, nonatomic) TabContents* tabContents;
 
-// Create the contents of a tab represented by |contents|.
-- (id)initWithContents:(TabContents*)contents;
+- (id)initWithContents:(TabContents*)contents
+              delegate:(id<TabContentsControllerDelegate>)delegate;
 
+// Call when the tab contents is about to be replaced with the currently
+// selected tab contents to do not trigger unnecessary content relayout.
+- (void)ensureContentsSizeDoesNotChange;
+
+// Call when the tab view is properly sized and the render widget host view
+// should be put into the view hierarchy.
+- (void)ensureContentsVisible;
+
+// Call to change the underlying tab contents object. View is not changed,
+// call |-ensureContentsVisible| to display the |newContents|'s render widget
+// host view.
+- (void)changeTabContents:(TabContents*)newContents;
+
 // Called when the tab contents is the currently selected tab and is about to be
 // removed from the view hierarchy.
 - (void)willBecomeUnselectedTab;
@@ -35,14 +65,6 @@
 // enabled.
 - (void)willBecomeSelectedTab;
 
-// Call when the tab contents is about to be replaced with the currently
-// selected tab contents to do not trigger unnecessary content relayout.
-- (void)ensureContentsSizeDoesNotChange;
-
-// Call when the tab view is properly sized and the render widget host view
-// should be put into the view hierarchy.
-- (void)ensureContentsVisible;
-
 // Called when the tab contents is updated in some non-descript way (the
 // notification from the model isn't specific). |updatedContents| could reflect
 // an entirely new tab contents object.