(Mac) Intercept (Cocoa) cursor setting by plugins and forward it on properly....

chrome/plugin/plugin_interpose_util_mac.mm

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/plugin/plugin_interpose_util_mac.h"
 
 #import <AppKit/AppKit.h>
 #import <objc/runtime.h>
 
 #include "chrome/common/plugin_messages.h"
@@ skipping 57 matching lines @@
         new PluginProcessHostMsg_PluginHideWindow(window_id, window_bounds));
   }
 }
 
 __attribute__((visibility("default")))
 void NotifyPluginOfSetThemeCursor(WebPluginDelegateImpl* delegate,
                                   ThemeCursor cursor) {
   delegate->SetThemeCursor(cursor);
 }
 
-
 }  // namespace mac_plugin_interposing
 
 #pragma mark -
 
 struct WindowInfo {
   uint32 window_id;
   CGRect bounds;
   WindowInfo(NSWindow* window) {
     NSInteger window_num = [window windowNumber];
     window_id = window_num > 0 ? window_num : 0;
@@ skipping 73 matching lines @@
   mac_plugin_interposing::SwitchToPluginProcess();
   // This is out-of-order relative to the other calls, but runModalForWindow:
   // won't return until the window closes, and the order only matters for
   // full-screen windows.
   OnPluginWindowShown(WindowInfo(window), YES);
   return [self chromePlugin_runModalForWindow:window];
 }
 
 @end
 
+@interface NSCursor (ChromePluginInterposing)
+- (void)chromePlugin_set;
+@end
+
+@implementation NSCursor (ChromePluginInterposing)
+
+- (void)chromePlugin_set {
+  WebPluginDelegateImpl* delegate = mac_plugin_interposing::GetActiveDelegate();
+  if (delegate) {
+    delegate->SetNSCursor(self);
+    return;
+  }
+  [self chromePlugin_set];
+}
+
+@end
+
 #pragma mark -
 
 static void ExchangeMethods(Class target_class, SEL original, SEL replacement) {
   Method m1 = class_getInstanceMethod(target_class, original);
   Method m2 = class_getInstanceMethod(target_class, replacement);
   if (m1 && m2)
     method_exchangeImplementations(m1, m2);
   else
     NOTREACHED() << "Cocoa swizzling failed";
 }
 
 namespace mac_plugin_interposing {
 
 void SetUpCocoaInterposing() {
   Class nswindow_class = [NSWindow class];
   ExchangeMethods(nswindow_class, @selector(orderOut:),
                   @selector(chromePlugin_orderOut:));
   ExchangeMethods(nswindow_class, @selector(orderFront:),
                   @selector(chromePlugin_orderFront:));
   ExchangeMethods(nswindow_class, @selector(makeKeyAndOrderFront:),
                   @selector(chromePlugin_makeKeyAndOrderFront:));
   ExchangeMethods(nswindow_class, @selector(_setWindowNumber:),
                   @selector(chromePlugin_setWindowNumber:));
 
   ExchangeMethods([NSApplication class], @selector(runModalForWindow:),
                   @selector(chromePlugin_runModalForWindow:));
+
+  ExchangeMethods([NSCursor class], @selector(set),
+                  @selector(chromePlugin_set));
 }
 
 }  // namespace mac_plugin_interposing