[Mac] Implement LocationBarViewMac::UpdateLocationBarVisibility()

chrome/browser/ui/cocoa/browser_window_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_
 
 // A class acting as the Objective-C controller for the Browser
 // object. Handles interactions between Cocoa and the cross-platform
 // code. Each window has a single toolbar and, by virtue of being a
@@ skipping 164 matching lines @@
 
   // When going fullscreen for a tab, we need to store the URL and the
   // fullscreen type, since we can't show the bubble until
   // -windowDidEnterFullScreen: gets called.
   GURL fullscreenUrl_;
   ExclusiveAccessBubbleType exclusiveAccessBubbleType_;
 
   // The Extension Command Registry used to determine which keyboard events to
   // handle.
   scoped_ptr<ExtensionKeybindingRegistryCocoa> extension_keybinding_registry_;
+
+  BOOL shouldShowToolbar_;

[tapted, 2015/09/08 05:55:05]

needs a comment. Importantly, it needs to explain why it's different to `-
(BOOL)hasToolbar` Also perhaps invert the logic so that `NO` is the default
case, then you don't need to initialize it (i.e. toolbarHidden_). But! I don't
think you need this anyway.

[dominickn, 2015/10/09 06:37:02]

Done.

 }
 
 // A convenience class method which gets the |BrowserWindowController| for a
 // given window. This method returns nil if no window in the chain has a BWC.
 + (BrowserWindowController*)browserWindowControllerForWindow:(NSWindow*)window;
 
 // A convenience class method which gets the |BrowserWindowController| for a
 // given view.  This is the controller for the window containing |view|, if it
 // is a BWC, or the first controller in the parent-window chain that is a
 // BWC. This method returns nil if no window in the chain has a BWC.
@@ skipping 413 matching lines @@
 - (ExclusiveAccessBubbleWindowController*)exclusiveAccessBubbleWindowController;
 
 // Gets the rect, in window base coordinates, that the omnibox popup should be
 // positioned relative to.
 - (NSRect)omniboxPopupAnchorRect;
 
 @end  // @interface BrowserWindowController (TestingAPI)
 
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_H_