[rb][BiDi] Add Activate browser command

rb/lib/selenium/webdriver/bidi/browsing_context.rb

@@ -100,6 +100,11 @@ def set_viewport(context_id: nil, width: nil, height: nil, device_pixel_ratio: n
           params = {context: context_id, viewport: {width:, height:}, device_pixel_ratio:}
           @bidi.send_cmd('browsingContext.setViewport', **params)
         end
+
+        def activate(context_id: nil)
+          context_id ||= @bridge.window_handle
+          @bidi.send_cmd('browsingContext.activate', context: context_id)
+        end
       end
     end # BiDi
   end # WebDriver

rb/sig/lib/selenium/webdriver/bidi/browsing_context.rbs

@@ -8,6 +8,8 @@ module Selenium
 
         def initialize: (Remote::Bridge bridge) -> void
 
+        def activate: (String? context_id) -> Hash[nil, nil]
+
         def navigate: (String url, String? context_id) -> void
 
         def set_viewport: (String context_id, Integer width, Integer height, Float device_pixel_ratio) -> Hash[nil, nil]

rb/spec/integration/selenium/webdriver/bidi/browsing_context_spec.rb

@@ -82,6 +82,17 @@ class BiDi
             expect(driver.execute_script('return window.devicePixelRatio')).to eq(2.0)
           end
         end
+
+        it 'activates a browser context' do
+          reset_driver!(web_socket_url: true) do |driver|
+            browsing_context = described_class.new(driver)
+            browsing_context.create
+
+            expect(driver.execute_script('return document.hasFocus();')).to be_falsey
+            browsing_context.activate
+            expect(driver.execute_script('return document.hasFocus();')).to be_truthy
+          end
+        end
       end
     end # BiDi
   end # WebDriver