Enable keyboard shortcuts and some menu commands for browserless Panels.

chrome/browser/ui/panels/panel_host.cc

Index: chrome/browser/ui/panels/panel_host.cc
diff --git a/chrome/browser/ui/panels/panel_host.cc b/chrome/browser/ui/panels/panel_host.cc
index c8e998c5552d4c9290cec2b51f226da15086da4a..d96dfee2beab8aa7c2202a8f54d09a8c7a9b2d19 100644
--- a/chrome/browser/ui/panels/panel_host.cc
+++ b/chrome/browser/ui/panels/panel_host.cc
@@ -96,10 +96,23 @@ bool PanelHost::IsPopupOrPanel(const content::WebContents* source) const {
   return true;
 }
 
+void PanelHost::ContentsZoomChange(bool zoom_in) {
+  panel_->ContentsZoomChange(zoom_in);
+}
+
 bool PanelHost::IsApplication() const {
   return true;
 }
 
+bool PanelHost::HandleContextMenu(const content::ContextMenuParams& params) {
+  return true;  // Disallow context menu.
+}
+
+void PanelHost::HandleKeyboardEvent(
+    const content::NativeWebKeyboardEvent& event) {
+  return panel_->HandleKeyboardEvent(event);
+}
+
 void PanelHost::ResizeDueToAutoResize(content::WebContents* web_contents,
                                       const gfx::Size& new_size) {
   panel_->OnContentsAutoResized(new_size);