Enhance chrome.app.window API for shelf integration with pinning support

ash/common/shelf/shelf_delegate.h

Index: ash/common/shelf/shelf_delegate.h
diff --git a/ash/common/shelf/shelf_delegate.h b/ash/common/shelf/shelf_delegate.h
index fa5e0b9cc66d2e373a82005967214fb94ec4330d..fc72c64cb4581bda85c11fc40d458b22536b40b2 100644
--- a/ash/common/shelf/shelf_delegate.h
+++ b/ash/common/shelf/shelf_delegate.h
@@ -42,6 +42,14 @@ class ASH_EXPORT ShelfDelegate {
   // Get the shelf ID from an application ID.
   virtual ShelfID GetShelfIDForAppID(const std::string& app_id) = 0;
 
+  // Get the shelf ID from an application ID and a launch ID.
+  // The launch ID can be passed to an app when launched in order to support
+  // multiple shelf items per app. This id is used together with the app_id to
+  // uniquely identify each shelf item that has the same app_id.

[James Cook, 2016/09/01 16:15:18]

nit: I would also say something like: "For example, a single virtualization app
might want to show different shelf icons for different remote apps."  People
reason well from examples.

[Andra Paraschiv, 2016/09/02 07:35:44]

Done.

+  virtual ShelfID GetShelfIDForAppIDAndLaunchID(
+      const std::string& app_id,
+      const std::string& launch_id) = 0;
+
   // Checks whether a mapping exists from the ShelfID |id| to an app id.
   virtual bool HasShelfIDToAppIDMapping(ShelfID id) const = 0;