LibWeb+LibWebView+WebContent: Implement more <input type=file> behavior

We had previous implemented some plumbing for file input elements in
commit 636602a54e.

This implements the return path for chromes to inform WebContent of the
file(s) the user selected. This patch includes a dummy implementation
for headless-browser to enable testing.

Userland/Services/WebContent/ConnectionFromClient.cpp

@@ -28,6 +28,8 @@
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Dump.h>
 #include <LibWeb/HTML/BrowsingContext.h>
+#include <LibWeb/HTML/HTMLInputElement.h>
+#include <LibWeb/HTML/SelectedFile.h>
 #include <LibWeb/HTML/Storage.h>
 #include <LibWeb/HTML/TraversableNavigable.h>
 #include <LibWeb/HTML/Window.h>
@@ -1317,6 +1319,18 @@ void ConnectionFromClient::color_picker_update(u64 page_id, Optional<Color> cons
     page.page().color_picker_update(picked_color, state);
 }
 
+void ConnectionFromClient::file_picker_closed(u64 page_id, Vector<Web::HTML::SelectedFile> const& selected_files)
+{
+    auto maybe_page = page(page_id);
+    if (!maybe_page.has_value()) {
+        dbgln("ConnectionFromClient::color_picker_update: No page with ID {}", page_id);
+        return;
+    }
+
+    auto& page = maybe_page.release_value();
+    page.page().file_picker_closed(const_cast<Vector<Web::HTML::SelectedFile>&>(selected_files));
+}
+
 void ConnectionFromClient::select_dropdown_closed(u64 page_id, Optional<String> const& value)
 {
     auto maybe_page = page(page_id);

Userland/Services/WebContent/ConnectionFromClient.h

@@ -106,6 +106,7 @@ private:
     virtual void confirm_closed(u64 page_id, bool accepted) override;
     virtual void prompt_closed(u64 page_id, Optional<String> const& response) override;
     virtual void color_picker_update(u64 page_id, Optional<Color> const& picked_color, Web::HTML::ColorPickerUpdateState const& state) override;
+    virtual void file_picker_closed(u64 page_id, Vector<Web::HTML::SelectedFile> const& selected_files) override;
     virtual void select_dropdown_closed(u64 page_id, Optional<String> const& value) override;
 
     virtual void toggle_media_play_state(u64 page_id) override;

Userland/Services/WebContent/PageClient.cpp

@@ -549,6 +549,11 @@ void PageClient::page_did_request_color_picker(Color current_color)
     client().async_did_request_color_picker(m_id, current_color);
 }
 
+void PageClient::page_did_request_file_picker(Web::HTML::AllowMultipleFiles allow_multiple_files)
+{
+    client().async_did_request_file_picker(m_id, allow_multiple_files);
+}
+
 void PageClient::page_did_request_select_dropdown(Web::CSSPixelPoint content_position, Web::CSSPixels minimum_width, Vector<Web::HTML::SelectItem> items)
 {
     client().async_did_request_select_dropdown(m_id, page().css_to_device_point(content_position).to_type<int>(), minimum_width * device_pixels_per_css_pixel(), items);

Userland/Services/WebContent/PageClient.h

@@ -133,6 +133,7 @@ private:
     virtual void page_did_close_top_level_traversable() override;
     virtual void request_file(Web::FileRequest) override;
     virtual void page_did_request_color_picker(Color current_color) override;
+    virtual void page_did_request_file_picker(Web::HTML::AllowMultipleFiles) override;
     virtual void page_did_request_select_dropdown(Web::CSSPixelPoint content_position, Web::CSSPixels minimum_width, Vector<Web::HTML::SelectItem> items) override;
     virtual void page_did_finish_text_test() override;
     virtual void page_did_change_theme_color(Gfx::Color color) override;

Userland/Services/WebContent/WebContentClient.ipc

@@ -6,6 +6,7 @@
 #include <LibWeb/Cookie/ParsedCookie.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/HTML/ActivateTab.h>
+#include <LibWeb/HTML/SelectedFile.h>
 #include <LibWeb/HTML/SelectItem.h>
 #include <LibWeb/HTML/WebViewHints.h>
 #include <LibWeb/Page/Page.h>
@@ -70,6 +71,7 @@ endpoint WebContentClient
     did_request_fullscreen_window(u64 page_id) => (Gfx::IntRect window_rect)
     did_request_file(u64 page_id, ByteString path, i32 request_id) =|
     did_request_color_picker(u64 page_id, Color current_color) =|
+    did_request_file_picker(u64 page_id, Web::HTML::AllowMultipleFiles allow_multiple_files) =|
     did_request_select_dropdown(u64 page_id, Gfx::IntPoint content_position, i32 minimum_width, Vector<Web::HTML::SelectItem> items) =|
     did_finish_handling_input_event(u64 page_id, bool event_was_accepted) =|
     did_change_theme_color(u64 page_id, Gfx::Color color) =|

Userland/Services/WebContent/WebContentServer.ipc

@@ -6,6 +6,7 @@
 #include <LibWeb/CSS/PreferredColorScheme.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/HTML/ColorPickerUpdateState.h>
+#include <LibWeb/HTML/SelectedFile.h>
 #include <LibWeb/WebDriver/ExecuteScript.h>
 #include <LibWebView/Attribute.h>
 
@@ -93,6 +94,7 @@ endpoint WebContentServer
     confirm_closed(u64 page_id, bool accepted) =|
     prompt_closed(u64 page_id, Optional<String> response) =|
     color_picker_update(u64 page_id, Optional<Color> picked_color, Web::HTML::ColorPickerUpdateState state) =|
+    file_picker_closed(u64 page_id, Vector<Web::HTML::SelectedFile> selected_files) =|
     select_dropdown_closed(u64 page_id, Optional<String> value) =|
 
     toggle_media_play_state(u64 page_id) =|