LibWeb: Implement the CanvasRenderingContext2D::rect path method

This method adds a rectangle to the current 2D path.

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp

@@ -188,6 +188,17 @@ void CanvasRenderingContext2D::quadratic_curve_to(float cx, float cy, float x, f
     m_path.quadratic_bezier_curve_to({ cx, cy }, { x, y });
 }
 
+void CanvasRenderingContext2D::rect(float x, float y, float width, float height)
+{
+    m_path.move_to({ x, y });
+    if (width == 0 || height == 0)
+        return;
+    m_path.line_to({ x + width, y });
+    m_path.line_to({ x + width, y + height });
+    m_path.line_to({ x, y + height });
+    m_path.close();
+}
+
 void CanvasRenderingContext2D::stroke()
 {
     auto painter = this->painter();

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h

@@ -33,6 +33,7 @@
 #include <LibGfx/Painter.h>
 #include <LibGfx/Path.h>
 #include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/DOM/ExceptionOr.h>
 
 namespace Web::HTML {
 
@@ -73,6 +74,7 @@ public:
     void move_to(float x, float y);
     void line_to(float x, float y);
     void quadratic_curve_to(float cx, float cy, float x, float y);
+    void rect(float x, float y, float width, float height);
     void stroke();
 
     // FIXME: We should only have one fill(), really. Fix the wrapper generator!

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl

@@ -15,6 +15,7 @@ interface CanvasRenderingContext2D {
     undefined moveTo(double x, double y);
     undefined lineTo(double x, double y);
     undefined quadraticCurveTo(double cpx, double cpy, double x, double y);
+    undefined rect(double x, double y, double width, double height);
 
     undefined drawImage(HTMLImageElement image, double dx, double dy);