Mac low power video: Support child windows, sheets, and transitions

chrome/browser/ui/cocoa/browser_window_controller_private.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/browser_window_controller_private.h"
 
 #include <cmath>
 
 #import "base/auto_reset.h"
 #include "base/command_line.h"
@@ skipping 743 matching lines @@
 
   enteringImmersiveFullscreen_ = NO;
   enteringPresentationMode_ = NO;
 
   [self resetCustomAppKitFullscreenVariables];
   [[tabStripController_ activeTabContentsController]
       updateFullscreenWidgetFrame];
 
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
+
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetInFullscreenTransition(false);

[spqchan, 2016/06/07 22:30:32]

Why aren't we setting it to true in windowWillEnterFullscreen? Because
allowed_by_fullscreen_transition_ is false by default? Maybe add a comment about
it

[ccameron, 2016/06/07 23:12:50]

Good point -- updated.

 }
 
 - (void)windowWillExitFullScreen:(NSNotification*)notification {
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetInFullscreenTransition(true);
+
   if (notification)  // For System Fullscreen when non-nil.
     [self registerForContentViewResizeNotifications];
   exitingAppKitFullscreen_ = YES;
 
   // Like windowWillEnterFullScreen, if we use custom animations,
   // adjustUIForExitingFullscreen should be called after the layout resizes in
   // startCustomAnimationToExitFullScreenWithDuration.
   if (isUsingCustomAnimation_) {
     blockLayoutSubviews_ = YES;
     [self.chromeContentView setAutoresizesSubviews:NO];
@@ skipping 484 matching lines @@
   return nil;
 }
 
 - (BOOL)isFullscreenForTabContentOrExtension {
   FullscreenController* controller =
       browser_->exclusive_access_manager()->fullscreen_controller();
   return controller->IsWindowFullscreenForTabOrPending() ||
          controller->IsExtensionFullscreenOrPending();
 }
 
+- (void)windowWillBeginSheet:(NSNotification*)notification {
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetHasActiveSheet(true);
+}
+
+- (void)windowDidEndSheet:(NSNotification*)notification {
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetHasActiveSheet(false);
+}
+
+- (void)childWindowsDidChange {
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->ChildWindowsChanged();
+}
+
 @end  // @implementation BrowserWindowController(Private)