[rAC] Allow sub-views to trigger layout reflow.

chrome/browser/ui/cocoa/autofill/autofill_main_container.mm

 // Copyright (c) 2013 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/autofill/autofill_main_container.h"
 
+#include <algorithm>
+#include <cmath>
+
 #include "chrome/browser/ui/cocoa/autofill/autofill_dialog_constants.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_button.h"
 #import "chrome/browser/ui/cocoa/autofill/autofill_details_container.h"
 #import "chrome/browser/ui/cocoa/key_equivalent_constants.h"
 #include "grit/generated_resources.h"
 #import "third_party/GTM/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 #include "ui/base/cocoa/window_size_constants.h"
 #include "ui/base/l10n/l10n_util.h"
 
 @interface AutofillMainContainer (Private)
@@ skipping 25 matching lines @@
   detailsContainer_.reset(
       [[AutofillDetailsContainer alloc] initWithController:controller_]);
   NSSize frameSize = [[detailsContainer_ view] frame].size;
   [[detailsContainer_ view] setFrameOrigin:
       NSMakePoint(0, NSHeight([buttonContainer_ frame]))];
   frameSize.height += NSHeight([buttonContainer_ frame]);
   [[self view] setFrameSize:frameSize];
   [[self view] addSubview:[detailsContainer_ view]];
 }
 
+- (NSSize)preferredSize {
+  // The buttons never change size, so rely on container.
+  NSSize buttonSize = [buttonContainer_ frame].size;
+  NSSize detailsSize = [detailsContainer_ preferredSize];
+
+  NSSize size = NSMakeSize(std::max(buttonSize.width, detailsSize.width),
+                           buttonSize.height + detailsSize.height);
+
+  return size;
+}
+
+- (void)performLayout {
+  // Assume that the frame for the container is set already.
+  [detailsContainer_ performLayout];
+}
+
 - (void)buildWindowButtonsForFrame:(NSRect)frame {
   if (buttonContainer_.get())
     return;
 
   buttonContainer_.reset([[GTMWidthBasedTweaker alloc] initWithFrame:
       ui::kWindowSizeDeterminedLater]);
   [buttonContainer_
       setAutoresizingMask:(NSViewMinXMargin | NSViewMaxYMargin)];
 
   scoped_nsobject<NSButton> button(
@@ skipping 31 matching lines @@
 
 - (AutofillSectionContainer*)sectionForId:(autofill::DialogSection)section {
   return [detailsContainer_ sectionForId:section];
 }
 
 - (void)modelChanged {
   [detailsContainer_ modelChanged];
 }
 
 @end