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..34f7080f03969358496359b32a9bc8df01e9e92b 100644
--- a/ash/common/shelf/shelf_delegate.h
+++ b/ash/common/shelf/shelf_delegate.h
@@ -42,6 +42,11 @@ 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.
+  virtual ShelfID GetShelfIDForAppIDAndLaunchID(
+      const std::string& app_id,
+      const std::string& launch_id) = 0;

[James Cook, 2016/09/01 04:27:51]

|launch_id| needs to be documented at this level as well.

(Steven, are you sure you like launch_id? I find it pretty confusing.
app_window_id or app_window_key or window_key might be better. We just use the
word "launch" too much.)

[Andra Paraschiv, 2016/09/01 08:27:25]

Added the comment for launch_id.

+
   // Checks whether a mapping exists from the ShelfID |id| to an app id.
   virtual bool HasShelfIDToAppIDMapping(ShelfID id) const = 0;