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

chrome/browser/ui/panels/panel_browser_view.h

Index: chrome/browser/ui/panels/panel_browser_view.h
diff --git a/chrome/browser/ui/panels/panel_browser_view.h b/chrome/browser/ui/panels/panel_browser_view.h
index 00798fbd277307659463744bdf2369bd073f531c..e6e8dee001c2d94ae43d76b414728b95e8033632 100644
--- a/chrome/browser/ui/panels/panel_browser_view.h
+++ b/chrome/browser/ui/panels/panel_browser_view.h
@@ -38,8 +38,9 @@ class PanelBrowserView : public BrowserView,
 
   // Called from frame view when titlebar receives a mouse event.
   // Return true if the event is handled.
-  bool OnTitlebarMousePressed(const gfx::Point& location);
-  bool OnTitlebarMouseDragged(const gfx::Point& location);
+  // |mouse_location| is in screen coordinates.
+  bool OnTitlebarMousePressed(const gfx::Point& mouse_location);
+  bool OnTitlebarMouseDragged(const gfx::Point& mouse_location);
   bool OnTitlebarMouseReleased();
   bool OnTitlebarMouseCaptureLost();