[ABANDONED] Simplify ash shelf dimmer.

ui/views/widget/drop_helper.cc

Index: ui/views/widget/drop_helper.cc
diff --git a/ui/views/widget/drop_helper.cc b/ui/views/widget/drop_helper.cc
index 540301a61aae2fc7644c88d6166add19288d4bd6..667d953fcba6dec94a37f6e1ef3df3c07a5d1620 100644
--- a/ui/views/widget/drop_helper.cc
+++ b/ui/views/widget/drop_helper.cc
@@ -11,14 +11,9 @@
 
 namespace views {
 
-DropHelper::DropHelper(View* root_view)
-    : root_view_(root_view),
-      target_view_(NULL),
-      deepest_view_(NULL) {
-}
+DropHelper::DropHelper(View* root_view) : root_view_(root_view) {}
 
-DropHelper::~DropHelper() {
-}
+DropHelper::~DropHelper() {}
 
 void DropHelper::ResetTargetViewIfEquals(View* view) {
   if (target_view_ == view)
@@ -30,6 +25,11 @@ void DropHelper::ResetTargetViewIfEquals(View* view) {
 int DropHelper::OnDragOver(const OSExchangeData& data,
                            const gfx::Point& root_view_location,
                            int drag_operation) {
+  LOG(ERROR) << "MSW DropHelper::OnDragOver";
+  if (!drag_over_widget_)
+    root_view_->GetWidget()->OnDragEnter();
+  drag_over_widget_ = true;
+
   View* view = CalculateTargetViewImpl(root_view_location, data, true,
                                        &deepest_view_);
 
@@ -44,6 +44,8 @@ int DropHelper::OnDragOver(const OSExchangeData& data,
 }
 
 void DropHelper::OnDragExit() {
+  root_view_->GetWidget()->OnDragExit();
+  drag_over_widget_ = false;
   NotifyDragExit();
   deepest_view_ = target_view_ = NULL;
 }
@@ -51,6 +53,9 @@ void DropHelper::OnDragExit() {
 int DropHelper::OnDrop(const OSExchangeData& data,
                        const gfx::Point& root_view_location,
                        int drag_operation) {
+  root_view_->GetWidget()->OnDragExit();
+  drag_over_widget_ = false;
+
   View* drop_view = target_view_;
   deepest_view_ = target_view_ = NULL;
   if (!drop_view)