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

chrome/browser/ui/panels/panel_window_controller_cocoa.mm

Index: chrome/browser/ui/panels/panel_window_controller_cocoa.mm
diff --git a/chrome/browser/ui/panels/panel_window_controller_cocoa.mm b/chrome/browser/ui/panels/panel_window_controller_cocoa.mm
index 97f05e339422a55d03b1bd7ca2f473e21867d7a5..0576fcc44e54af4f10e9998d34e6f4f19f9a4df6 100644
--- a/chrome/browser/ui/panels/panel_window_controller_cocoa.mm
+++ b/chrome/browser/ui/panels/panel_window_controller_cocoa.mm
@@ -32,6 +32,7 @@
 #include "chrome/browser/ui/panels/panel_settings_menu_model.h"
 #include "chrome/browser/ui/panels/panel_strip.h"
 #import "chrome/browser/ui/panels/panel_titlebar_view_cocoa.h"
+#import "chrome/browser/ui/panels/panel_utils_cocoa.h"
 #include "chrome/browser/ui/toolbar/encoding_menu_controller.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_service.h"
@@ -408,9 +409,15 @@ enum {
   return windowShim_->panel()->draggable();
 }
 
-- (void)startDrag {
+- (void)startDrag:(NSPoint)mouseLocation {
   animateOnBoundsChange_ = NO;
-  windowShim_->panel()->manager()->StartDragging(windowShim_->panel());
+
+  // Convert from Cocoa's screen coordinates to platform-indepedent screen
+  // coordinates because PanelManager method takes platform-indepedent screen
+  // coordinates.
+  windowShim_->panel()->manager()->StartDragging(
+      windowShim_->panel(),
+      cocoa_utils::ConvertPointFromCocoaCoordinates(mouseLocation));
 }
 
 - (void)endDrag:(BOOL)cancelled {
@@ -418,9 +425,12 @@ enum {
   windowShim_->panel()->manager()->EndDragging(cancelled);
 }
 
-- (void)dragWithDeltaX:(int)deltaX
-                deltaY:(int)deltaY {
-  windowShim_->panel()->manager()->Drag(deltaX, deltaY);
+- (void)drag:(NSPoint)mouseLocation {
+  // Convert from Cocoa's screen coordinates to platform-indepedent screen
+  // coordinates because PanelManager method takes platform-indepedent screen
+  // coordinates.
+  windowShim_->panel()->manager()->Drag(
+      cocoa_utils::ConvertPointFromCocoaCoordinates(mouseLocation));
 }
 
 - (void)setPanelFrame:(NSRect)frame