Change panel drag related methods to use mouse location in screen coordinates.

chrome/browser/ui/panels/panel_manager.h

Index: chrome/browser/ui/panels/panel_manager.h
diff --git a/chrome/browser/ui/panels/panel_manager.h b/chrome/browser/ui/panels/panel_manager.h
index 3194cf8ca85cae2fb8e60426a932dfc9738dc725..f368ecef5a3c8b8bffd835438ec8e475294464f7 100644
--- a/chrome/browser/ui/panels/panel_manager.h
+++ b/chrome/browser/ui/panels/panel_manager.h
@@ -46,8 +46,9 @@ class PanelManager : public AutoHidingDesktopBar::Observer {
   void OnPanelClosed(Panel* panel);
 
   // Drags the given panel.
-  void StartDragging(Panel* panel);
-  void Drag(int delta_x, int delta_y);
+  // |mouse_location| is in screen coordinate system.
+  void StartDragging(Panel* panel, const gfx::Point& mouse_location);
+  void Drag(const gfx::Point& mouse_location);
   void EndDragging(bool cancelled);
 
   // Invoked when a panel's expansion state changes.