Switch to doing user-resizing via system for panels on Mac

chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h

Index: chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h
diff --git a/chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h b/chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h
index 6627170482f46b3f2fb0e77f78d008d6e7287c67..601dda1da8d169a392f903eefa373c79a78c5c40 100644
--- a/chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h
+++ b/chrome/browser/ui/cocoa/panels/panel_window_controller_cocoa.h
@@ -15,6 +15,7 @@
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/chrome_browser_window.h"
 #include "chrome/browser/ui/panels/panel.h"
+#import "ui/base/cocoa/tracking_area.h"
 
 class PanelCocoa;
 @class PanelTitlebarViewCocoa;
@@ -42,12 +43,16 @@ class PanelCocoa;
   // window over other application windows due to panels having a higher
   // priority NSWindowLevel, so we distinguish between the two scenarios.
   BOOL activationRequestedByPanel_;
-  base::scoped_nsobject<NSView> overlayView_;
+
+  BOOL userResizing_;
+  ui::ScopedCrTrackingArea trackingArea_;
 }
 
 // Load the window nib and do any Cocoa-specific initialization.
 - (id)initWithPanel:(PanelCocoa*)window;
 
+- (Panel*)panel;
+
 - (void)webContentsInserted:(content::WebContents*)contents;
 - (void)webContentsDetached:(content::WebContents*)contents;
 
@@ -134,8 +139,9 @@ class PanelCocoa;
 // Adjusts NSWindowCollectionBehavior based on whether panel is always on top.
 - (void)updateWindowCollectionBehavior;
 
-// Turns on user-resizable corners/sides indications and enables live resize.
-- (void)enableResizeByMouse:(BOOL)enable;
+// Updates the tracking area per the window size change. This is needed in
+// order to receive the NSMouseMoved notification.
+- (void)updateTrackingArea;
 
 // Turns on/off shadow effect around the window shape.
 - (void)showShadow:(BOOL)show;