[Mac] Reveal Fullscreen Toolbar for Tab Strip Changes

chrome/browser/ui/cocoa/browser_window_controller.mm

Index: chrome/browser/ui/cocoa/browser_window_controller.mm
diff --git a/chrome/browser/ui/cocoa/browser_window_controller.mm b/chrome/browser/ui/cocoa/browser_window_controller.mm
index 4ab8af89a5846f6f22131b898c78520a55fe9f89..71587ccddc701fb959fa9ba0911f43be10cf8dc3 100644
--- a/chrome/browser/ui/cocoa/browser_window_controller.mm
+++ b/chrome/browser/ui/cocoa/browser_window_controller.mm
@@ -1028,6 +1028,13 @@ bool IsTabDetachingInFullscreenEnabled() {
     if (manager)
       manager->DisplayPendingRequests();
   }
+
+  // If the web contents want to focus on the location bar, do not call the
+  // animation since the location bar will drop down when it's focused.
+  bool willFocusLocationBar =
+      newContents && newContents->FocusLocationBarByDefault();
+  if ([self isInAnyFullscreenMode] && !willFocusLocationBar)
+    [[self presentationModeController] revealToolbarForTabStripChanges];
 }
 
 - (void)zoomChangedForActiveTab:(BOOL)canShowBubble {
@@ -1476,6 +1483,13 @@ bool IsTabDetachingInFullscreenEnabled() {
   [infoBarContainerController_ tabDetachedWithContents:contents];
 }
 
+- (void)onTabInsertedInForeground:(BOOL)inForeground {
+  if ([self isInAnyFullscreenMode] && !inForeground &&
+      ![toolbarController_ isLocationBarFocused]) {
+    [[self presentationModeController] revealToolbarForTabStripChanges];
+  }
+}
+
 - (void)userChangedTheme {
   NSView* rootView = [[[self window] contentView] superview];
   [rootView cr_recursivelyInvokeBlock:^(id view) {
@@ -1824,6 +1838,10 @@ willAnimateFromState:(BookmarkBar::State)oldState
   return presentationModeController_.get();
 }
 
+- (void)setPresentationModeController:(PresentationModeController*)controller {
+  presentationModeController_.reset([controller retain]);
+}
+
 - (void)executeExtensionCommand:(const std::string&)extension_id
                         command:(const extensions::Command&)command {
   // Global commands are handled by the ExtensionCommandsGlobalRegistry