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

chrome/browser/ui/cocoa/browser_window_controller_private.mm

Index: chrome/browser/ui/cocoa/browser_window_controller_private.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller_private.mm b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
index 1564f0c8bc974b6852ae0f5d895d4bb0a7a869e1..b6ce3acc059d881b2597ef04cee0481b18c728ad 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller_private.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller_private.mm
@@ -761,9 +761,15 @@ - (void)windowDidEnterFullScreen:(NSNotification*)notification {
 
   [self showFullscreenExitBubbleIfNecessary];
   browser_->WindowFullscreenStateChanged();
+
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetInFullscreenTransition(false);
 }
 
 - (void)windowWillExitFullScreen:(NSNotification*)notification {
+  if (fullscreenLowPowerCoordinator_)
+    fullscreenLowPowerCoordinator_->SetInFullscreenTransition(true);
+
   if (notification)  // For System Fullscreen when non-nil.
     [self registerForContentViewResizeNotifications];
   exitingAppKitFullscreen_ = YES;
@@ -1268,4 +1274,19 @@ - (BOOL)isFullscreenForTabContentOrExtension {
          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)