arc: Set custom icon in shelf for ARC apps.

components/arc/test/fake_app_instance.h

Index: components/arc/test/fake_app_instance.h
diff --git a/components/arc/test/fake_app_instance.h b/components/arc/test/fake_app_instance.h
index 7eab7891450820d40d01e589d1908913e20428ac..91306ae6cfaa92db3dcce8a3674361756c61b901 100644
--- a/components/arc/test/fake_app_instance.h
+++ b/components/arc/test/fake_app_instance.h
@@ -121,6 +121,9 @@ class FakeAppInstance : public mojom::AppInstance {
   void SendTaskCreated(int32_t taskId,
                        const mojom::AppInfo& app,
                        const std::string& intent);
+  void SendTaskDescription(int32_t taskId,
+                           const std::string& label,
+                           const std::string& icon_png_data);

[Luis Héctor Chávez, 2017/05/18 18:09:40]

nit: icon_png_data_as_string (for consistency with the other functions).

[khmel, 2017/05/18 20:27:52]

Done.

   void SendTaskDestroyed(int32_t taskId);
   bool GenerateAndSendIcon(const mojom::AppInfo& app,
                            mojom::ScaleFactor scale_factor,