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diff --git a/webkit/glue/plugins/plugin_instance_mac.mm b/webkit/glue/plugins/plugin_instance_mac.mm
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+++ b/webkit/glue/plugins/plugin_instance_mac.mm
@@ -0,0 +1,133 @@
+// Copyright (c) 2010 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 "build/build_config.h"
+
+#import <AppKit/AppKit.h>
+
+#include "base/logging.h"
+#include "webkit/glue/plugins/plugin_instance.h"
+
+// When C++ exceptions are disabled, the C++ library defines |try| and
+// |catch| so as to allow exception-expecting C++ code to build properly when
+// language support for exceptions is not present.  These macros interfere
+// with the use of |@try| and |@catch| in Objective-C files such as this one.
+// Undefine these macros here, after everything has been #included, since
+// there will be no C++ uses and only Objective-C uses from this point on.
+#undef try
+#undef catch
+
+#if MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_5
+@interface NSMenu (SnowLeopardMenuPopUpDeclaration)
+- (BOOL)popUpMenuPositioningItem:(NSMenuItem*)item
+                      atLocation:(NSPoint)location
+                          inView:(NSView*)view;
+@end
+#endif
+
+namespace {
+
+// Returns an autoreleased NSEvent constructed from the given np_event,
+// targeting the given window.
+NSEvent* NSEventForNPCocoaEvent(NPCocoaEvent* np_event, NSWindow* window) {
+  bool mouse_down = 1;
+  switch (np_event->type) {
+    case NPCocoaEventMouseDown:
+      mouse_down = 1;
+      break;
+    case NPCocoaEventMouseUp:
+      mouse_down = 0;
+      break;
+    default:
+      // If plugins start bringing up context menus for things other than
+      // clicks, this will need more plumbing; for now just log it and proceed
+      // as if it were a mouse down.
+      NOTREACHED();
+  }
+  NSEventType event_type = NSLeftMouseDown;
+  switch (np_event->data.mouse.buttonNumber) {
+    case 0:
+      event_type = mouse_down ? NSLeftMouseDown : NSLeftMouseUp;
+      break;
+    case 1:
+      event_type = mouse_down ? NSRightMouseDown : NSRightMouseUp;
+      break;
+    default:
+      event_type = mouse_down ? NSOtherMouseDown : NSOtherMouseUp;
+      break;
+  }
+
+  NSInteger click_count = np_event->data.mouse.clickCount;
+  NSInteger modifiers = np_event->data.mouse.modifierFlags;
+  // NPCocoaEvent doesn't have a timestamp, so just use the current time.
+  NSEvent* event =
+      [NSEvent mouseEventWithType:event_type
+                         location:NSMakePoint(0, 0)
+                    modifierFlags:modifiers
+                        timestamp:[[NSApp currentEvent] timestamp]
+                     windowNumber:[window windowNumber]
+                          context:[NSGraphicsContext currentContext]
+                      eventNumber:0
+                       clickCount:click_count
+                         pressure:1.0];
+  return event;
+}
+
+}  // namespace
+
+namespace NPAPI {
+
+NPError PluginInstance::PopUpContextMenu(NPMenu* menu) {
+  if (!currently_handled_event_)
+    return NPERR_GENERIC_ERROR;
+
+  CGRect main_display_bounds = CGDisplayBounds(CGMainDisplayID());
+  NSPoint screen_point = NSMakePoint(
+      plugin_origin_.x() + currently_handled_event_->data.mouse.pluginX,
+      plugin_origin_.y() + currently_handled_event_->data.mouse.pluginY);
+  // Plugin offsets are upper-left based, so flip vertically for Cocoa.
+  screen_point.y = main_display_bounds.size.height - screen_point.y;
+
+  NSMenu* nsmenu = reinterpret_cast<NSMenu*>(menu);
+  NPError return_val = NPERR_NO_ERROR;
+  NSWindow* window = nil;
+  @try {
+    if ([nsmenu respondsToSelector:
+           @selector(popUpMenuPositioningItem:atLocation:inView:)]) {
+      [nsmenu popUpMenuPositioningItem:nil atLocation:screen_point inView:nil];
+    } else {
+      NSRect dummy_window_rect = NSMakeRect(screen_point.x, screen_point.y,
+                                            1, 1);
+      window = [[NSWindow alloc] initWithContentRect:dummy_window_rect
+                                           styleMask:NSBorderlessWindowMask
+                                             backing:NSBackingStoreNonretained
+                                               defer:YES];
+      [window setTitle:@"PopupMenuDummy"];  // Lets interposing identify it.
+      [window setAlphaValue:0];
+      [window makeKeyAndOrderFront:nil];
+      [NSMenu popUpContextMenu:nsmenu
+                     withEvent:NSEventForNPCocoaEvent(currently_handled_event_,
+                                                      window)
+                       forView:[window contentView]];
+    }
+  }
+  @catch (NSException* e) {
+    NSLog(@"Caught exception while handling PopUpContextMenu: %@", e);
+    return_val = NPERR_GENERIC_ERROR;
+  }
+
+  if (window) {
+    @try {
+      [window orderOut:nil];
+      [window release];
+    }
+    @catch (NSException* e) {
+      NSLog(@"Caught exception while cleaning up in PopUpContextMenu: %@", e);
+    }
+  }
+
+  return return_val;
+}
+
+}  // namespace NPAPI