Fix several issues around fullscreen Mac plugins:...

webkit/glue/plugins/webplugin_delegate_impl_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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "webkit/glue/plugins/webplugin_delegate_impl.h"
 
 #include <string>
 #include <vector>
@@ skipping 545 matching lines @@
   }
 
   std::string mime_type;
   NPAPI::PluginStreamUrl *stream = instance()->CreateStream(
       resource_id, url, mime_type, notify_needed,
       reinterpret_cast<void*>(notify_data));
   return stream;
 }
 
 void WebPluginDelegateImpl::OnNullEvent() {
+  if (!webkit_glue::IsPluginRunningInRendererProcess()) {
+    // If the plugin is running in a subprocess, drain any pending system
+    // events so that the plugin's event handlers will get called on any
+    // windows it has created.  Filter out activate/deactivate events on
+    // the fake browser window, but pass everything else through.
+    EventRecord event;
+    while (GetNextEvent(everyEvent, &event)) {
+      if (event.what == activateEvt && cg_context_.window &&
+          reinterpret_cast<void *>(event.message) != cg_context_.window)
+        continue;
+      instance()->NPP_HandleEvent(&event);
+    }
+  }
+
+  // Send an idle event so that the plugin can do background work
   NPEvent np_event = {0};
   np_event.what = nullEvent;
   np_event.when = TickCount();
   np_event.modifiers = GetCurrentKeyModifiers();
   if (!Button())
     np_event.modifiers |= btnState;
   np_event.where.h = last_mouse_x_;
   np_event.where.v = last_mouse_y_;
   instance()->NPP_HandleEvent(&np_event);
 
   MessageLoop::current()->PostDelayedTask(FROM_HERE,
       null_event_factory_.NewRunnableMethod(
           &WebPluginDelegateImpl::OnNullEvent),
       kPluginIdleThrottleDelayMs);
 }