Implement app launch changes for app runtime extension proposal.

extensions/common/api/app_runtime.idl

Index: extensions/common/api/app_runtime.idl
diff --git a/extensions/common/api/app_runtime.idl b/extensions/common/api/app_runtime.idl
index 4a848f808ec6bcc39b5faec38c43eab0a9d06726..ef0f6e0cf89f4ff49b0e0af5fb0f559e635635cc 100644
--- a/extensions/common/api/app_runtime.idl
+++ b/extensions/common/api/app_runtime.idl
@@ -38,6 +38,21 @@ namespace app.runtime {
     installed_notification
   };
 
+  // An app can be launched with a specific action in mind, for example, to
+  // create a new note. If action data is present, a special UI should be shown
+  // that is optimized for the flow. The type of action the app was launched
+  // with is available inside of the |action_data| field from the LaunchData
+  // instance.
+  enum ActionType {
+    // The user wants to quickly take a new note.
+    new_note
+  };
+
+  // Specifies the <code>ActionType</code> the app was launched with.
+  dictionary ActionData {
+    ActionType action_type;
+  };
+
   // Optional data for the launch. Either <code>items</code>, or
   // the pair (<code>url, referrerUrl</code>) can be present for any given
   // launch.
@@ -71,6 +86,11 @@ namespace app.runtime {
 
     // Where the app is launched from.
     LaunchSource? source;
+
+    // Contains data that specifies what type of action this app was launched
+    // with. This is null if the app was not launched with a specific action in
+    // mind.
+    ActionData? action_data;
   };
 
   // This object specifies details and operations to perform on the embedding