Tab dragging as implemented as a mus API.

ui/views/mus/native_widget_mus.cc

Index: ui/views/mus/native_widget_mus.cc
diff --git a/ui/views/mus/native_widget_mus.cc b/ui/views/mus/native_widget_mus.cc
index 8c882176eaea533f57f34cf8d633eca373f21dc4..a5f81ecb289915218d25d2f46c42a8eda1bf19f1 100644
--- a/ui/views/mus/native_widget_mus.cc
+++ b/ui/views/mus/native_widget_mus.cc
@@ -7,6 +7,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/bitmap_uploader/bitmap_uploader.h"
 #include "components/mus/public/cpp/property_type_converters.h"
@@ -29,6 +30,7 @@
 #include "ui/base/view_prop.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
+#include "ui/display/screen.h"
 #include "ui/events/event.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/path.h"
@@ -328,7 +330,7 @@ SkBitmap AppIconFromDelegate(WidgetDelegate* delegate) {
   return app_icon.GetRepresentation(1.f).sk_bitmap();
 }
 
-// Handles acknowledgement of an input event, either immediately when a nested
+// Handles acknowledgment of an input event, either immediately when a nested
 // message loop starts, or upon destruction.
 class EventAckHandler : public base::MessageLoop::NestingObserver {
  public:
@@ -438,6 +440,13 @@ class NativeWidgetMus::MusWindowObserver : public mus::WindowObserver {
     DCHECK_EQ(window, mus_window());
     window_tree_host()->SetBounds(new_bounds);
   }
+  void OnWindowBoundsChanged(mus::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override {
+    Widget* widget = NativeWidgetMus::GetWidgetForWindow(window);
+    if (widget)
+      widget->OnNativeWidgetMove();
+  }
   void OnWindowFocusChanged(mus::Window* gained_focus,
                             mus::Window* lost_focus) override {
     if (gained_focus == mus_window())
@@ -804,14 +813,14 @@ void NativeWidgetMus::ViewRemoved(View* view) {
 // used safely in a world where we separate things with mojo. They should be
 // removed; not ported.
 void NativeWidgetMus::SetNativeWindowProperty(const char* name, void* value) {
-  // TODO(beng): push properties to mus::Window.
-  // NOTIMPLEMENTED();
+  native_window_properties_[name] = value;
 }
 
 void* NativeWidgetMus::GetNativeWindowProperty(const char* name) const {
-  // TODO(beng): pull properties to mus::Window.
-  // NOTIMPLEMENTED();
-  return nullptr;
+  auto it = native_window_properties_.find(name);
+  if (it == native_window_properties_.end())
+    return nullptr;
+  return it->second;
 }
 
 TooltipManager* NativeWidgetMus::GetTooltipManager() const {
@@ -1166,12 +1175,16 @@ Widget::MoveLoopResult NativeWidgetMus::RunMoveLoop(
     const gfx::Vector2d& drag_offset,
     Widget::MoveLoopSource source,
     Widget::MoveLoopEscapeBehavior escape_behavior) {
-  // NOTIMPLEMENTED();
-  return Widget::MOVE_LOOP_CANCELED;
+  ReleaseCapture();
+
+  gfx::Point cursor_location =
+      display::Screen::GetScreen()->GetCursorScreenPoint();
+  bool success = window_->PerformWindowMove(cursor_location);
+  return success ? Widget::MOVE_LOOP_SUCCESSFUL : Widget::MOVE_LOOP_CANCELED;
 }
 
 void NativeWidgetMus::EndMoveLoop() {
-  // NOTIMPLEMENTED();
+  window_->CancelWindowMove();
 }
 
 void NativeWidgetMus::SetVisibilityChangedAnimationsEnabled(bool value) {