LibWeb: Give SVG geometry elements a position

This makes the selected-in-the-inspector outline appear in the right
place. We take the stroke-width into account when producing the
bounding box, which makes the fit nice and snug. :^)

Userland/Libraries/LibWeb/SVG/SVGContext.h

@@ -8,12 +8,14 @@
 
 #include <AK/Vector.h>
 #include <LibGfx/Color.h>
+#include <LibGfx/Rect.h>
 
 namespace Web {
 
 class SVGContext {
 public:
-    SVGContext()
+    SVGContext(Gfx::FloatRect svg_element_bounds)
+        : m_svg_element_bounds(svg_element_bounds)
     {
         m_states.append(State());
     }
@@ -26,6 +28,8 @@ public:
     void set_stroke_color(Gfx::Color color) { state().stroke_color = color; }
     void set_stroke_width(float width) { state().stroke_width = width; }
 
+    Gfx::FloatPoint svg_element_position() const { return m_svg_element_bounds.top_left(); }
+
     void save() { m_states.append(m_states.last()); }
     void restore() { m_states.take_last(); }
 
@@ -39,6 +43,7 @@ private:
     const State& state() const { return m_states.last(); }
     State& state() { return m_states.last(); }
 
+    Gfx::FloatRect m_svg_element_bounds;
     Vector<State> m_states;
 };