Revert of mac: Implement custom AppKit Enter Fullscreen transition.

chrome/browser/ui/cocoa/browser_window_enter_fullscreen_transition.h

-// Copyright 2015 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_FULLSCREEN_TRANSITION_H_
-#define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_FULLSCREEN_TRANSITION_H_
-
-#import <Cocoa/Cocoa.h>
-
-// This class is responsible for managing the custom transition of a
-// BrowserWindow from its normal state into an AppKit Fullscreen state.
-//
-// By default, when AppKit Fullscreens a window, it creates a new virtual
-// desktop and slides it in from the right of the screen. At the same time, the
-// old virtual desktop slides off to the left. This animation takes one second,
-// and the time is not customizable without elevated privileges or a
-// self-modifying binary
-// (https://code.google.com/p/chromium/issues/detail?id=414527). During that
-// second, no user interaction is possible.
-//
-// The default implementation of the AppKit transition smoothly animates a
-// window from its original size to the full size of the screen. At the
-// beginning of the animation, it takes a snapshot of the window's current
-// state. Then it resizes the window, calls drawRect: (theorized, not tested),
-// and takes a snapshot of the window's final state. The animation is a simple
-// crossfade between the two snapshots. This has a flaw. Frequently, the
-// renderer has not yet drawn content for the resized window by the time
-// drawRect: is called. As a result, the animation is effectively a no-op. When
-// the animation is finished, the new web content flashes in.
-//
-// The window's delegate can override two methods to customize the transition.
-//  -customWindowsToEnterFullScreenForWindow:
-//    The return of this method is an array of NSWindows. Each window that is
-//    returned will be added to the new virtual desktop after the animation is
-//    finished, but will not be a part of the animation itself.
-//  -window:startCustomAnimationToEnterFullScreenWithDuration:
-//    In this method, the window's delegate adds animations to the windows
-//    returned in the above method.
-//
-// The goal of this class is to mimic the default animation, but instead of
-// taking a snapshot of the final web content, it uses the live web content
-// during the animation.
-//
-// See https://code.google.com/p/chromium/issues/detail?id=414527#c22 and its
-// preceding comments for a more detailed description of the implementation,
-// and the reasoning behind the decisions made.
-//
-// Recommended usage:
-//  (Override method on NSWindow's delegate)
-//  - (NSArray*)customWindowsToEnterFullScreenForWindow:(NSWindow*)window {
-//    self.transition = [[[BrowserWindowEnterFullscreenTransition alloc]
-//        initWithWindow:window] autorelease];
-//    return [self.transition customWindowsToEnterFullScreen];
-//  }
-//
-//  (Override method on NSWindow's delegate)
-//  - (void)window:(NSWindow*)window
-//  startCustomAnimationToEnterFullScreenWithDuration:(NSTimeInterval)duration {
-//    [self.transition
-//        startCustomAnimationToEnterFullScreenWithDuration:duration];
-//  }
-//
-//  (Override method on NSWindow's delegate)
-//  - (void)windowDidEnterFullScreen:(NSNotification*)notification {
-//    self.transition = nil;
-//  }
-//
-//  (Override method on NSWindow)
-//  - (NSRect)constrainFrameRect:(NSRect)frame toScreen:(NSScreen*)screen {
-//    if (self.transition && ![self.transition shouldWindowBeConstrained])
-//      return frame;
-//    return [super constrainFrameRect:frame toScreen:screen];
-//  }
-
-@interface BrowserWindowEnterFullscreenTransition : NSObject
-
-// Designated initializer. |window| is the NSWindow that is going to be moved
-// into a fullscreen Space (virtual desktop), and resized to have the same size
-// as the screen. |window|'s root view must be layer backed.
-- (instancetype)initWithWindow:(NSWindow*)window;
-
-// Returns the windows to be used in the custom transition.
-//   - Takes a snapshot of the current window.
-//   - Makes a new snapshot window which shows the snapshot in the same
-//   location as the current window.
-//   - Adds the style mask NSFullScreenWindowMask to the current window.
-//   - Makes the current window transparent, and resizes the current window to
-//   be the same size as the screen.
-- (NSArray*)customWindowsToEnterFullScreen;
-
-// Begins the animations used for the custom fullscreen transition.
-//   - Animates the snapshot to the full size of the screen while fading it out.
-//   - Animates the current window from it's original location to its final
-//   location, while fading it in.
-// Note: The two animations are added to different layers in different windows.
-// There is no explicit logic to keep the two animations in sync. If this
-// proves to be a problem, the relevant layers should attempt to sync up their
-// time offsets with CACurrentMediaTime().
-- (void)startCustomAnimationToEnterFullScreenWithDuration:
-    (NSTimeInterval)duration;
-
-// When this method returns true, the NSWindow method
-// -constrainFrameRect:toScreen: must return the frame rect without
-// constraining it. The owner of the instance of this class is responsible for
-// hooking up this logic.
-- (BOOL)shouldWindowBeUnconstrained;
-
-@end
-
-#endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_FULLSCREEN_TRANSITION_H_