Teach SkyView how to load the main script

sky/engine/core/script/dart_loader.h

Index: sky/engine/core/script/dart_loader.h
diff --git a/sky/engine/core/script/dart_loader.h b/sky/engine/core/script/dart_loader.h
index f538e966b5aefaab1eb2058935194a5396388458..aab5ee44bbe01afb21eb82edfbfbdb60a53b945e 100644
--- a/sky/engine/core/script/dart_loader.h
+++ b/sky/engine/core/script/dart_loader.h
@@ -19,6 +19,7 @@ namespace blink {
 class DartState;
 class DartDependency;
 class DartDependencyCatcher;
+class KURL;
 
 // TODO(abarth): This class seems more complicated than it needs to be. Is
 // there some way of simplifying this system? For example, we have a bunch
@@ -34,6 +35,8 @@ class DartLoader {
                                       Dart_Handle library,
                                       Dart_Handle url);
 
+  void LoadLibrary(const KURL& url);
+
   void WaitForDependencies(const HashSet<DartDependency*>& dependencies,
                            const base::Closure& callback);