Refactor SkyShell to allow multiple SkyViews

sky/shell/ios/sky_view_controller.mm

Index: sky/shell/ios/sky_view_controller.mm
diff --git a/sky/shell/ios/sky_view_controller.mm b/sky/shell/ios/sky_view_controller.mm
index ee2e38ad762b1c9ac9ed8e7e7c3620ef789f4671..24bfef1c065e208c7f8d9b3f31472b4f60034075 100644
--- a/sky/shell/ios/sky_view_controller.mm
+++ b/sky/shell/ios/sky_view_controller.mm
@@ -8,10 +8,14 @@
 #import <UIKit/UIKit.h>
 #import <QuartzCore/QuartzCore.h>
 
+#include "sky/shell/shell_view.h"
+
 @implementation SkyViewController
 
 - (void)loadView {
-  SkySurface* surface = [[SkySurface alloc] init];
+
+  ShellView* shell_view = new sky::shell::ShellView(sky::shell::Shell::Shared());
+  SkySurface* surface = [[SkySurface alloc] initWithShellView: shell_view];
 
   surface.autoresizingMask =
       UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;