MacViews: Implemented Drag & Drop

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index da6acf2f6a6058fe3d52ded46b29a8c893c4e8c6..55c7224c660dc387ff4ddf91814811106a28e831 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -24,6 +24,7 @@
 #import "ui/gfx/mac/coordinate_conversion.h"
 #import "ui/gfx/mac/nswindow_frame_controls.h"
 #import "ui/views/cocoa/bridged_content_view.h"
+#import "ui/views/cocoa/drag_drop_client_mac.h"
 #import "ui/views/cocoa/cocoa_mouse_capture.h"
 #include "ui/views/cocoa/tooltip_manager_mac.h"
 #import "ui/views/cocoa/views_nswindow_delegate.h"
@@ -336,6 +337,7 @@ BridgedNativeWidget::BridgedNativeWidget(NativeWidgetMac* parent)
   DCHECK(parent);
   window_delegate_.reset(
       [[ViewsNSWindowDelegate alloc] initWithBridgedNativeWidget:this]);
+  drag_drop_client_.reset(new DragDropClientMac(this));

[tapted, 2016/05/24 08:06:01]

can this be done at the end of BridgedNativeWidget::Init()? Just after
tooltip_manager_ might make sense, since they're declared that way

[spqchan, 2016/05/26 01:56:53]

Done.

 }
 
 BridgedNativeWidget::~BridgedNativeWidget() {
@@ -527,6 +529,8 @@ void BridgedNativeWidget::SetRootView(views::View* view) {
 
   if (view) {
     bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
+    drag_drop_client_->SetRootView(view);

[tapted, 2016/05/24 08:06:01]

hopefully we don't need this if we can avoid some of the weirdness of
BridgedNativeWidgetTest -- we just need more of the setup from views::Widget

+
     // Objective C initializers can return nil. However, if |view| is non-NULL
     // this should be treated as an error and caught early.
     CHECK(bridged_view_);