Bug 591763 - Add application window menu

When we have multiple windows for an application, implement the following
behavior:

* On click + immediate release, go to the most recently used
* On click, hold for 0.6s, pop up a menu with windows, filtering
  the window list to just those windows.
  Mouse over on the window list highlights the moused-over window.

Implement this by splitting well item into InactiveWellItem
and RunningWellItem, sharing a base class BaseWellItem.

src/shell-drawing.c

@@ -146,6 +146,36 @@ shell_draw_clock (ClutterCairoTexture *texture,
   cairo_destroy (cr);
 }
 
+void
+shell_draw_box_pointer (ClutterCairoTexture *texture,
+                        ClutterColor        *border_color,
+                        ClutterColor        *background_color)
+{
+  guint width, height;
+  cairo_t *cr;
+
+  clutter_cairo_texture_get_surface_size (texture, &width, &height);
+
+  clutter_cairo_texture_clear (texture);
+  cr = clutter_cairo_texture_create (texture);
+
+  cairo_set_line_width (cr, 1.0);
+
+  clutter_cairo_set_source_color (cr, border_color);
+
+  cairo_move_to (cr, width, 0);
+  cairo_line_to (cr, 0, floor (height * 0.5));
+  cairo_line_to (cr, width, height);
+
+  cairo_stroke_preserve (cr);
+
+  clutter_cairo_set_source_color (cr, background_color);
+
+  cairo_fill (cr);
+
+  cairo_destroy (cr);
+}
+
 static void
 hook_paint_red_border (ClutterActor  *actor,
                        gpointer       user_data)

src/shell-drawing.h

@@ -13,6 +13,10 @@ ClutterCairoTexture *shell_create_vertical_gradient (ClutterColor *top,
 ClutterCairoTexture *shell_create_horizontal_gradient (ClutterColor *left,
                                                        ClutterColor *right);
 
+void shell_draw_box_pointer (ClutterCairoTexture *texture,
+                             ClutterColor        *border_color,
+                             ClutterColor        *background_color);
+
 void shell_draw_clock (ClutterCairoTexture *texture,
 	               int                  hour,
 	               int                  minute);