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..1c78ddf99f3cace91f386063640261ff246c0eb2 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/cocoa_drag_drop_manager.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_manager_.reset(new CocoaDragDropManager(this));
 }
 
 BridgedNativeWidget::~BridgedNativeWidget() {
@@ -526,7 +528,11 @@ void BridgedNativeWidget::SetRootView(views::View* view) {
   // the old views::View will be gone, so any method calls will become no-ops.
 
   if (view) {
-    bridged_view_.reset([[BridgedContentView alloc] initWithView:view]);
+    bridged_view_.reset([[BridgedContentView alloc]
+           initWithView:view
+        dragDropManager:drag_drop_manager_.get()]);
+    drag_drop_manager_->SetRootView(view);
+
     // 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_);