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

chrome/browser/ui/panels/native_panel.h

Index: chrome/browser/ui/panels/native_panel.h
diff --git a/chrome/browser/ui/panels/native_panel.h b/chrome/browser/ui/panels/native_panel.h
index 2298b77119fdc5a4f98b94457b8a048e177c4855..a2eb4e0563d8ba19a44b5f7850cda001bf4d252e 100644
--- a/chrome/browser/ui/panels/native_panel.h
+++ b/chrome/browser/ui/panels/native_panel.h
@@ -96,9 +96,11 @@ class NativePanelTesting {
   static NativePanelTesting* Create(NativePanel* native_panel);
   virtual ~NativePanelTesting() {}
 
-  virtual void PressLeftMouseButtonTitlebar(const gfx::Point& point) = 0;
+  // |mouse_location| is in screen coordinates.
+  virtual void PressLeftMouseButtonTitlebar(
+      const gfx::Point& mouse_location) = 0;
   virtual void ReleaseMouseButtonTitlebar() = 0;
-  virtual void DragTitlebar(int delta_x, int delta_y) = 0;
+  virtual void DragTitlebar(const gfx::Point& mouse_location) = 0;
   virtual void CancelDragTitlebar() = 0;
   virtual void FinishDragTitlebar() = 0;