chrome: Add ability to hide toolbar and app menu contents (see issue #3280)

This change adds new CefCommandHandler callbacks for optionally hiding
specific Chrome toolbar icons, buttons and app menu items.

To test: Run `cefclient --enable-chrome-runtime --filter-chrome-commands`.
Most icons, buttons and app/context menu items will be hidden.

libcef/browser/chrome/browser_delegate.h

@@ -9,6 +9,7 @@
 #include <memory>
 
 #include "base/memory/scoped_refptr.h"
+#include "chrome/browser/ui/page_action/page_action_icon_type.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "ui/base/window_open_disposition.h"
 
@@ -65,6 +66,32 @@ class BrowserDelegate : public content::WebContentsDelegate {
     return false;
   }
 
+  // Return true if the app menu item should be visible. ID values come from
+  // chrome/app/chrome_command_ids.h.
+  virtual bool IsAppMenuItemVisible(int command_id) { return true; }
+
+  // Return true if the app menu item should be enabled. ID values come from
+  // chrome/app/chrome_command_ids.h.
+  virtual bool IsAppMenuItemEnabled(int command_id) { return true; }
+
+  // Return true if the page action icon should be visible.
+  virtual bool IsPageActionIconVisible(PageActionIconType icon_type) {
+    return true;
+  }
+
+  enum class ToolbarButtonType {
+    kCast = 0,
+    kDownload,
+    kSendTabToSelf,
+    kSidePanel,
+    kMaxValue = kSidePanel,
+  };
+
+  // Return true if the toolbar button should be visible.
+  virtual bool IsToolbarButtonVisible(ToolbarButtonType button_type) {
+    return true;
+  }
+
   // Same as RequestMediaAccessPermission but returning |callback| if the
   // request is unhandled.
   [[nodiscard]] virtual content::MediaResponseCallback

libcef/browser/chrome/chrome_browser_delegate.cc

@@ -122,6 +122,60 @@ bool ChromeBrowserDelegate::HandleCommand(int command_id,
   return false;
 }
 
+bool ChromeBrowserDelegate::IsAppMenuItemVisible(int command_id) {
+  if (auto browser = ChromeBrowserHostImpl::GetBrowserForBrowser(browser_)) {
+    if (auto client = browser->GetClient()) {
+      if (auto handler = client->GetCommandHandler()) {
+        return handler->IsChromeAppMenuItemVisible(browser.get(), command_id);
+      }
+    }
+  }
+  return true;
+}
+
+bool ChromeBrowserDelegate::IsAppMenuItemEnabled(int command_id) {
+  if (auto browser = ChromeBrowserHostImpl::GetBrowserForBrowser(browser_)) {
+    if (auto client = browser->GetClient()) {
+      if (auto handler = client->GetCommandHandler()) {
+        return handler->IsChromeAppMenuItemEnabled(browser.get(), command_id);
+      }
+    }
+  }
+  return true;
+}
+
+bool ChromeBrowserDelegate::IsPageActionIconVisible(
+    PageActionIconType icon_type) {
+  // Verify that our enum matches Chromium's values.
+  static_assert(static_cast<int>(CEF_CPAIT_MAX_VALUE) ==
+                    static_cast<int>(PageActionIconType::kMaxValue),
+                "enum mismatch");
+
+  if (auto client = create_params_.client) {
+    if (auto handler = client->GetCommandHandler()) {
+      return handler->IsChromePageActionIconVisible(
+          static_cast<cef_chrome_page_action_icon_type_t>(icon_type));
+    }
+  }
+  return true;
+}
+
+bool ChromeBrowserDelegate::IsToolbarButtonVisible(
+    ToolbarButtonType button_type) {
+  // Verify that our enum matches BrowserDelegate's values.
+  static_assert(static_cast<int>(CEF_CTBT_MAX_VALUE) ==
+                    static_cast<int>(ToolbarButtonType::kMaxValue),
+                "enum mismatch");
+
+  if (auto client = create_params_.client) {
+    if (auto handler = client->GetCommandHandler()) {
+      return handler->IsChromeToolbarButtonVisible(
+          static_cast<cef_chrome_toolbar_button_type_t>(button_type));
+    }
+  }
+  return true;
+}
+
 content::MediaResponseCallback
 ChromeBrowserDelegate::RequestMediaAccessPermissionEx(
     content::WebContents* web_contents,

libcef/browser/chrome/chrome_browser_delegate.h

@@ -56,6 +56,10 @@ class ChromeBrowserDelegate : public cef::BrowserDelegate {
   bool ShowStatusBubble(bool show_by_default) override;
   bool HandleCommand(int command_id,
                      WindowOpenDisposition disposition) override;
+  bool IsAppMenuItemVisible(int command_id) override;
+  bool IsAppMenuItemEnabled(int command_id) override;
+  bool IsPageActionIconVisible(PageActionIconType icon_type) override;
+  bool IsToolbarButtonVisible(ToolbarButtonType button_type) override;
   [[nodiscard]] content::MediaResponseCallback RequestMediaAccessPermissionEx(
       content::WebContents* web_contents,
       const content::MediaStreamRequest& request,