Support buttons attribute for drag event (chromium side).

ui/views/widget/desktop_aura/desktop_drop_target_win.cc

Index: ui/views/widget/desktop_aura/desktop_drop_target_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_drop_target_win.cc b/ui/views/widget/desktop_aura/desktop_drop_target_win.cc
index f10fc1fc34b3b4e2573478c1710c62cb0ae84f91..b1ec429e2ad4bfa87a71a5e68ff6a70638e3a557 100644
--- a/ui/views/widget/desktop_aura/desktop_drop_target_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_drop_target_win.cc
@@ -94,6 +94,26 @@ void DesktopDropTargetWin::OnWindowDestroyed(aura::Window* window) {
   target_window_ = NULL;
 }
 
+static int ConvertKeyStateToAuraEventFlags(DWORD key_state)

[Avi (use Gerrit), 2015/03/10 03:14:07]

Why are you putting this function in the middle of nowhere? Move it to the top
of the file and put it into an anonymous namespace.

[zino, 2015/03/10 08:47:23]

Done.

+{
+    int flags = 0;
+
+    if (key_state & MK_CONTROL)
+        flags |= ui::EF_CONTROL_DOWN;
+    if (key_state & MK_ALT)
+        flags |= ui::EF_ALT_DOWN;
+    if (key_state & MK_SHIFT)
+        flags |= ui::EF_SHIFT_DOWN;
+    if (key_state & MK_LBUTTON)
+        flags |= ui::EF_LEFT_MOUSE_BUTTON;
+    if (key_state & MK_MBUTTON)
+        flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
+    if (key_state & MK_RBUTTON)
+        flags |= ui::EF_RIGHT_MOUSE_BUTTON;
+
+    return flags;
+}
+
 void DesktopDropTargetWin::Translate(
     IDataObject* data_object,
     DWORD key_state,
@@ -132,11 +152,7 @@ void DesktopDropTargetWin::Translate(
       location,
       root_location,
       ui::DragDropTypes::DropEffectToDragOperation(effect)));
-  int flags = 0;
-  flags |= base::win::IsAltPressed() ? ui::EF_ALT_DOWN : ui::EF_NONE;
-  flags |= base::win::IsShiftPressed() ? ui::EF_SHIFT_DOWN : ui::EF_NONE;
-  flags |= base::win::IsCtrlPressed() ? ui::EF_CONTROL_DOWN : ui::EF_NONE;
-  (*event)->set_flags(flags);
+  (*event)->set_flags(ConvertKeyStateToAuraEventFlags(key_state));
   if (target_window_changed)
     (*delegate)->OnDragEntered(*event->get());
 }