[fenix] For https://github.com/mozilla-mobile/fenix/issues/1843 - Closes the fragment when the arrow button is pressed

app/src/main/java/org/mozilla/fenix/collections/CollectionCreationComponent.kt

@@ -26,7 +26,7 @@ sealed class CollectionCreationChange : Change {
 }
 
 sealed class CollectionCreationAction : Action {
-
+    object Close : CollectionCreationAction()
 }
 
 class CollectionCreationComponent(

app/src/main/java/org/mozilla/fenix/collections/CollectionCreationUIView.kt

@@ -32,7 +32,7 @@ class CollectionCreationUIView(
 
     init {
         view.back_button.setOnClickListener {
-            Log.e("Collection Creation", "Back button tapped")
+            actionEmitter.onNext(CollectionCreationAction.Close)
         }
 
         view.select_all_button.setOnClickListener {

app/src/main/java/org/mozilla/fenix/collections/CreateCollectionFragment.kt

@@ -16,6 +16,7 @@ import androidx.lifecycle.ViewModelProviders
 import kotlinx.android.synthetic.main.fragment_create_collection.view.*
 import org.mozilla.fenix.R
 import org.mozilla.fenix.mvi.ActionBusFactory
+import org.mozilla.fenix.mvi.getAutoDisposeObservable
 import org.mozilla.fenix.mvi.getManagedEmitter
 
 class CreateCollectionFragment : DialogFragment() {
@@ -48,6 +49,12 @@ class CreateCollectionFragment : DialogFragment() {
         }!!.tabs
 
         getManagedEmitter<CollectionCreationChange>().onNext(CollectionCreationChange.TabListChange(tabs))
+
+        getAutoDisposeObservable<CollectionCreationAction>().subscribe {
+            when (it) {
+                is CollectionCreationAction.Close -> dismissAllowingStateLoss()
+            }
+        }
     }
 
     companion object {