MacViews: Implement Tab Dragging

ui/views/widget/native_widget_mac.mm

Index: ui/views/widget/native_widget_mac.mm
diff --git a/ui/views/widget/native_widget_mac.mm b/ui/views/widget/native_widget_mac.mm
index e64961a26d689b28b11a9ece1d086a4d79807d6d..2c9ad3ef520b316201442d43c0399c4dd8c459c0 100644
--- a/ui/views/widget/native_widget_mac.mm
+++ b/ui/views/widget/native_widget_mac.mm
@@ -292,13 +292,30 @@ void NativeWidgetMac::InitModalType(ui::ModalType modal_type) {
 }
 
 gfx::Rect NativeWidgetMac::GetWindowBoundsInScreen() const {
-  return gfx::ScreenRectFromNSRect([GetNativeWindow() frame]);
+  // -[NSWindow frame] doesn't update during a window drag. This is not what
+  // toolkit-views expects, so ask the window server directly.
+  //
+  // Note: Moving the window using the window server is asynchronous, and it can
+  // continue sending the frame updates (using NSWindowMovedEventType event)
+  // even after the mouse button is released.
+  NSRect frame_rect = [GetNativeWindow() frame];
+  if (bridge_->IsRunMoveLoopActive())
+    frame_rect = bridge_->WindowServerFrame();
+  return gfx::ScreenRectFromNSRect(frame_rect);
 }
 
 gfx::Rect NativeWidgetMac::GetClientAreaBoundsInScreen() const {
   NSWindow* window = GetNativeWindow();
-  return gfx::ScreenRectFromNSRect(
-      [window contentRectForFrameRect:[window frame]]);
+  NSRect frame_rect = [window frame];
+  // -[NSWindow frame] doesn't update during a window drag. This is not what
+  // toolkit-views expects, so ask the window server directly.
+  //
+  // Note: Moving the window using the window server is asynchronous, and it can
+  // continue sending the frame updates (using NSWindowMovedEventType event)
+  // even after the mouse button is released.
+  if (bridge_->IsRunMoveLoopActive())
+    frame_rect = bridge_->WindowServerFrame();
+  return gfx::ScreenRectFromNSRect([window contentRectForFrameRect:frame_rect]);
 }
 
 gfx::Rect NativeWidgetMac::GetRestoredBounds() const {
@@ -546,12 +563,15 @@ Widget::MoveLoopResult NativeWidgetMac::RunMoveLoop(
     const gfx::Vector2d& drag_offset,
     Widget::MoveLoopSource source,
     Widget::MoveLoopEscapeBehavior escape_behavior) {
-  NOTIMPLEMENTED();
-  return Widget::MOVE_LOOP_CANCELED;
+  if (!bridge_)
+    return Widget::MOVE_LOOP_CANCELED;
+
+  return bridge_->RunMoveLoop(drag_offset);
 }
 
 void NativeWidgetMac::EndMoveLoop() {
-  NOTIMPLEMENTED();
+  if (bridge_)
+    bridge_->EndMoveLoop();
 }
 
 void NativeWidgetMac::SetVisibilityChangedAnimationsEnabled(bool value) {