Wires up transient windows for aura-mus

ui/aura/test/mus/test_window_tree.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_
 #define UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_
 
 #include <stdint.h>
 
 #include <set>
 
 #include "base/macros.h"
 #include "services/ui/public/interfaces/window_tree.mojom.h"
+#include "ui/aura/mus/mus_types.h"
 
 namespace aura {
 
 enum class WindowTreeChangeType {
+  ADD_TRANSIENT,
   BOUNDS,
   // Used for both set and release capture.
   CAPTURE,
   FOCUS,
   NEW_TOP_LEVEL,
   NEW_WINDOW,
   PROPERTY,
+  REMOVE_TRANSIENT,
   VISIBLE,
 
   // This covers all cases that aren't used in tests.
   OTHER,
 };
 
+struct TransientData {
+  Id parent_id;
+  Id child_id;
+};
+
 // WindowTree implementation for tests. TestWindowTree maintains a list of all
 // calls that take a change_id and are expected to be acked back to the client.
 // Various functions are provided to respond to the changes.
 class TestWindowTree : public ui::mojom::WindowTree {
  public:
   TestWindowTree();
   ~TestWindowTree() override;
 
   void set_client(ui::mojom::WindowTreeClient* client) { client_ = client; }
 
@@ skipping 20 matching lines @@
   // one change of the specified type.
   bool AckFirstChangeOfType(WindowTreeChangeType type, bool result);
 
   void AckAllChangesOfType(WindowTreeChangeType type, bool result);
 
   bool GetAndRemoveFirstChangeOfType(WindowTreeChangeType type,
                                      uint32_t* change_id);
 
   size_t GetChangeCountForType(WindowTreeChangeType type);
 
+  // Data from most recent add/remove transient window.

[msw, 2016/10/27 23:46:10]

nit: "the most recently added/removed"?

[sky, 2016/10/28 03:16:32]

Done.

+  const TransientData& transient_data() const { return transient_data_; }
+
  private:
   struct Change {
     WindowTreeChangeType type;
     uint32_t id;
   };
 
   void OnChangeReceived(
       uint32_t change_id,
       WindowTreeChangeType type = WindowTreeChangeType::OTHER);
 
@@ skipping 88 matching lines @@
   uint32_t window_id_ = 0u;
 
   mojo::Array<uint8_t> last_property_value_;
 
   std::vector<Change> changes_;
 
   ui::mojom::WindowTreeClient* client_;
 
   mojo::Map<mojo::String, mojo::Array<uint8_t>> last_new_window_properties_;
 
+  TransientData transient_data_;
+
   DISALLOW_COPY_AND_ASSIGN(TestWindowTree);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_MUS_TEST_WINDOW_TREE_H_