LibWeb: Add Page::has_ongoing_navigation()

Introduce has_ongoing_navigation() that allows to check if resource
state in FrameLoading is pending. This API is going to be used in
upcoming fix for wait_for_navigation_to_complete() in WebDriver.

Userland/Libraries/LibWeb/Loader/FrameLoader.h

@@ -35,6 +35,8 @@ public:
 
     void load_html(StringView, const AK::URL&);
 
+    bool is_pending() const { return resource()->is_pending(); }
+
     HTML::BrowsingContext& browsing_context() { return m_browsing_context; }
     HTML::BrowsingContext const& browsing_context() const { return m_browsing_context; }
 

Userland/Libraries/LibWeb/Loader/Resource.cpp

@@ -33,8 +33,7 @@ Resource::Resource(Type type, Resource& resource)
     : m_request(resource.m_request)
     , m_encoded_data(move(resource.m_encoded_data))
     , m_type(type)
-    , m_loaded(resource.m_loaded)
-    , m_failed(resource.m_failed)
+    , m_state(resource.m_state)
     , m_error(move(resource.m_error))
     , m_encoding(move(resource.m_encoding))
     , m_mime_type(move(resource.m_mime_type))
@@ -89,12 +88,12 @@ static bool is_valid_encoding(StringView encoding)
 
 void Resource::did_load(Badge<ResourceLoader>, ReadonlyBytes data, HashMap<DeprecatedString, DeprecatedString, CaseInsensitiveStringTraits> const& headers, Optional<u32> status_code)
 {
-    VERIFY(!m_loaded);
+    VERIFY(m_state == State::Pending);
     // FIXME: Handle OOM failure.
     m_encoded_data = ByteBuffer::copy(data).release_value_but_fixme_should_propagate_errors();
     m_response_headers = headers.clone().release_value_but_fixme_should_propagate_errors();
     m_status_code = move(status_code);
-    m_loaded = true;
+    m_state = State::Loaded;
 
     auto content_type = headers.get("Content-Type");
 
@@ -136,7 +135,7 @@ void Resource::did_fail(Badge<ResourceLoader>, DeprecatedString const& error, Op
 {
     m_error = error;
     m_status_code = move(status_code);
-    m_failed = true;
+    m_state = State::Failed;
 
     for_each_client([](auto& client) {
         client.resource_did_fail();

Userland/Libraries/LibWeb/Loader/Resource.h

@@ -37,9 +37,16 @@ public:
 
     Type type() const { return m_type; }
 
-    bool is_loaded() const { return m_loaded; }
+    enum class State {
+        Pending,
+        Loaded,
+        Failed,
+    };
+
+    bool is_pending() const { return m_state == State::Pending; }
+    bool is_loaded() const { return m_state == State::Loaded; }
+    bool is_failed() const { return m_state == State::Failed; }
 
-    bool is_failed() const { return m_failed; }
     DeprecatedString const& error() const { return m_error; }
 
     bool has_encoded_data() const { return !m_encoded_data.is_empty(); }
@@ -71,8 +78,7 @@ private:
     LoadRequest m_request;
     ByteBuffer m_encoded_data;
     Type m_type { Type::Generic };
-    bool m_loaded { false };
-    bool m_failed { false };
+    State m_state { State::Pending };
     DeprecatedString m_error;
     Optional<DeprecatedString> m_encoding;
 

Userland/Libraries/LibWeb/Page/Page.cpp

@@ -52,6 +52,11 @@ void Page::load_html(StringView html, const AK::URL& url)
     top_level_browsing_context().loader().load_html(html, url);
 }
 
+bool Page::has_ongoing_navigation() const
+{
+    return top_level_browsing_context().loader().is_pending();
+}
+
 Gfx::Palette Page::palette() const
 {
     return m_client.palette();

Userland/Libraries/LibWeb/Page/Page.h

@@ -60,6 +60,8 @@ public:
 
     void load_html(StringView, const AK::URL&);
 
+    bool has_ongoing_navigation() const;
+
     CSSPixelPoint device_to_css_point(DevicePixelPoint) const;
     DevicePixelPoint css_to_device_point(CSSPixelPoint) const;
     CSSPixelRect device_to_css_rect(DevicePixelRect) const;