Add key modifier on minimize/restore button click to minimize/restore all Panels for Mac.

chrome/browser/ui/panels/panel.cc

Index: chrome/browser/ui/panels/panel.cc
diff --git a/chrome/browser/ui/panels/panel.cc b/chrome/browser/ui/panels/panel.cc
index 699159e35de6db1b57a4f90520053e5dae0f35f4..bb92907f010432807ea97d30552a1541c79f919a 100644
--- a/chrome/browser/ui/panels/panel.cc
+++ b/chrome/browser/ui/panels/panel.cc
@@ -747,6 +747,26 @@ void Panel::OnTitlebarClicked(panel::ClickModifier modifier) {
   FlashFrame(false);
 }
 
+void Panel::OnMinimizeButtonClicked(panel::ClickModifier modifier) {
+  if (!panel_strip_)
+    return;
+
+  if (modifier == panel::APPLY_TO_ALL)
+    panel_strip_->MinimizeAll();
+  else
+    Minimize();
+}
+
+void Panel::OnRestoreButtonClicked(panel::ClickModifier modifier) {
+  if (!panel_strip_)
+    return;
+
+  if (modifier == panel::APPLY_TO_ALL)
+    panel_strip_->RestoreAll();
+  else
+    Restore();
+}
+
 void Panel::DestroyBrowser() {
   native_panel_->DestroyPanelBrowser();
 }