[Mac] Turn on Auto Layout for browser windows.

chrome/browser/ui/cocoa/tabs/tab_window_controller.mm

 // Copyright (c) 2012 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/cocoa/tabs/tab_window_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/sdk_forward_declarations.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
@@ skipping 45 matching lines @@
 - (BOOL)hasDarkTheme {
   return [[self parentWindow] hasDarkTheme];
 }
 
 - (BOOL)inIncognitoModeWithSystemTheme {
   return [[self parentWindow] inIncognitoModeWithSystemTheme];
 }
 
 @end
 
+// Subview of the window's contentView, contains everything but the tab strip.
+@interface ChromeContentView : NSView
+@end
+
+@implementation ChromeContentView
+
+// NSView overrides.
+
+// Since Auto Layout and frame-based layout behave differently in small but
+// important ways (e.g. Auto Layout can restrict window resizing, frame-based
+// layout doesn't log a warning when a view's autoresizing mask can't be
+// maintained), ensure that it's on instead of letting it depend on content.
++ (BOOL)requiresConstraintBasedLayout {
+  return YES;
+}
+
+@end
+
 @implementation TabWindowController
 
 - (id)initTabWindowControllerWithTabStrip:(BOOL)hasTabStrip
                                  titleBar:(BOOL)hasTitleBar {
   const CGFloat kDefaultWidth = 750;
   const CGFloat kDefaultHeight = 600;
 
   NSRect contentRect = NSMakeRect(60, 229, kDefaultWidth, kDefaultHeight);
   base::scoped_nsobject<FramedBrowserWindow> window(
       [[FramedBrowserWindow alloc] initWithContentRect:contentRect
                                            hasTabStrip:hasTabStrip]);
   [window setReleasedWhenClosed:YES];
   [window setAutorecalculatesKeyViewLoop:YES];
 
   if ((self = [super initWithWindow:window])) {
     [[self window] setDelegate:self];
 
-    chromeContentView_.reset([[NSView alloc]
+    chromeContentView_.reset([[ChromeContentView alloc]
         initWithFrame:NSMakeRect(0, 0, kDefaultWidth, kDefaultHeight)]);
     [chromeContentView_
         setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
     [chromeContentView_ setWantsLayer:YES];
     [[[self window] contentView] addSubview:chromeContentView_];
 
     tabContentArea_.reset(
         [[FastResizeView alloc] initWithFrame:[chromeContentView_ bounds]]);
     [tabContentArea_ setAutoresizingMask:NSViewWidthSizable |
                                          NSViewHeightSizable];
@@ skipping 360 matching lines @@
 
 - (void)windowWillEnterFullScreenNotification:(NSNotification*)notification {
   [[visualEffectView_ animator] setAlphaValue:0.0];
 }
 
 - (void)windowWillExitFullScreenNotification:(NSNotification*)notification {
   [[visualEffectView_ animator] setAlphaValue:1.0];
 }
 
 @end