vmservice: Add /coverage collection to scripts, classes and libraries.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index c7ad01329a13641a5ef24c759e21ff3cc8353840..9c45c861ba4d27f8ed8f272e67f73aaa1fd07db9 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -2519,6 +2519,8 @@ class Script : public Object {
                         intptr_t* first_token_index,
                         intptr_t* last_token_index) const;
 
+  RawLibrary* FindLibrary() const;
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawScript));
   }
@@ -2527,6 +2529,8 @@ class Script : public Object {
                         const String& source,
                         RawScript::Kind kind);
 
+  static RawScript* FindByUrl(const String& url);
+
  private:
   void set_url(const String& value) const;
   void set_source(const String& value) const;