Update Panel titlebar text and icon layout when resized on Mac.

chrome/browser/ui/panels/panel_titlebar_view_cocoa.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/panels/panel_titlebar_view_cocoa.h"
 
 #include <Carbon/Carbon.h>  // kVK_Escape
 #import <Cocoa/Cocoa.h>
 
 #include "base/logging.h"
@@ skipping 176 matching lines @@
   [settingsButton_ setDefaultOpacity:0.6];
   [settingsButton_ setHoverImage:image];
   [settingsButton_ setHoverOpacity:0.9];
   [settingsButton_ setPressedImage:image];
   [settingsButton_ setPressedOpacity:1.0];
   [[settingsButton_ cell] setHighlightsBy:NSNoCellMask];
   [self checkMouseAndUpdateSettingsButtonVisibility];
 
   // Update layout of controls in the titlebar.
   [self updateCloseButtonLayout];
-  [self updateIconAndTitleLayout];
 
   // Set autoresizing behavior: glued to edges on left, top and right.
   [self setAutoresizingMask:(NSViewMinYMargin | NSViewWidthSizable)];
 
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(didChangeTheme:)
              name:kBrowserThemeDidChangeNotification
            object:nil];
-  // Register for various window focus changes, so we can update our custom
-  // titlebar appropriately.
+  [[NSNotificationCenter defaultCenter]
+      addObserver:self
+         selector:@selector(didChangeFrame:)
+             name:NSViewFrameDidChangeNotification
+           object:self];
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(didChangeMainWindow:)
              name:NSWindowDidBecomeMainNotification
            object:[self window]];
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(didChangeMainWindow:)
              name:NSWindowDidResignMainNotification
            object:[self window]];
@@ skipping 74 matching lines @@
 }
 
 - (void)mouseEntered:(NSEvent*)event {
   [[closeButton_ cell] setHighlighted:YES];
 }
 
 - (void)mouseExited:(NSEvent*)event {
   [[closeButton_ cell] setHighlighted:NO];
 }
 
+- (void)didChangeFrame:(NSNotification*)notification {
+  [self updateIconAndTitleLayout];
+}
+
 - (void)didChangeTheme:(NSNotification*)notification {
   [self setNeedsDisplay:YES];
 }
 
 - (void)didChangeMainWindow:(NSNotification*)notification {
   [self setNeedsDisplay:YES];
   [self checkMouseAndUpdateSettingsButtonVisibility];
 }
 
 - (void)mouseDown:(NSEvent*)event {
@@ skipping 91 matching lines @@
 - (BOOL)isDrawingAttention {
   return isDrawingAttention_;
 }
 
 
 // (Private/TestingAPI)
 - (PanelWindowControllerCocoa*)controller {
   return controller_;
 }
 
+- (NSTextField*)title {
+  return title_;
+}
+
 - (void)simulateCloseButtonClick {
   [[closeButton_ cell] performClick:closeButton_];
 }
 
 - (void)pressLeftMouseButtonTitlebar {
   NSEvent* event = MakeMouseEvent(NSLeftMouseDown, NSZeroPoint, 0);
   [self mouseDown:event];
 }
 
 - (void)releaseLeftMouseButtonTitlebar {
@@ skipping 26 matching lines @@
 }
 
 - (void)checkMouseAndUpdateSettingsButtonVisibility {
   BOOL mouseOverWindow = NSPointInRect([NSEvent mouseLocation],
                                        [[self window] frame]);
   [self updateSettingsButtonVisibility:mouseOverWindow];
 }
 
 @end