Revert of Remove a bunch of NPAPI quirks and related support code

content/child/npapi/plugin_host.cc

 // Copyright (c) 2012 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 "content/child/npapi/plugin_host.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include "base/command_line.h"
@@ skipping 484 matching lines @@
   // We deliberately do not implement this; we don't want plugins forcing
   // synchronous paints.
 }
 
 NPError NPN_GetValue(NPP id, NPNVariable variable, void* value) {
   // Allows the plugin to query the browser for information
   //
   // Variables:
   //    NPNVxDisplay (unix only)
   //    NPNVxtAppContext (unix only)
+  //    NPNVnetscapeWindow (win only) - Gets the native window on which the
+  //              plugin drawing occurs, returns HWND
   //    NPNVjavascriptEnabledBool:  tells whether Javascript is enabled
   //    NPNVasdEnabledBool:  tells whether SmartUpdate is enabled
   //    NPNVOfflineBool: tells whether offline-mode is enabled
 
   NPError rv = NPERR_GENERIC_ERROR;
 
   switch (static_cast<int>(variable)) {
     case NPNVWindowNPObject: {
       scoped_refptr<PluginInstance> plugin(FindInstance(id));
       if (!plugin.get()) {
@@ skipping 27 matching lines @@
       if (np_object) {
         WebBindings::retainObject(np_object);
         void** v = static_cast<void**>(value);
         *v = np_object;
         rv = NPERR_NO_ERROR;
       } else {
         NOTREACHED();
       }
       break;
     }
+  #if !defined(OS_MACOSX)  // OS X doesn't have windowed plugins.
+    case NPNVnetscapeWindow: {
+      scoped_refptr<PluginInstance> plugin = FindInstance(id);
+      if (!plugin.get()) {
+        NOTREACHED();
+        return NPERR_INVALID_INSTANCE_ERROR;
+      }
+      gfx::PluginWindowHandle handle = plugin->window_handle();
+      *((void**)value) = (void*)handle;
+      rv = NPERR_NO_ERROR;
+      break;
+    }
+  #endif
     case NPNVjavascriptEnabledBool: {
       // yes, JS is enabled.
       *((void**)value) = (void*)1;
       rv = NPERR_NO_ERROR;
       break;
     }
     case NPNVSupportsWindowless: {
       NPBool* supports_windowless = reinterpret_cast<NPBool*>(value);
       *supports_windowless = true;
       rv = NPERR_NO_ERROR;
@@ skipping 332 matching lines @@
 NPBool NPN_UnfocusInstance(NPP id, NPFocusDirection direction) {
   // TODO: Implement advanced key handling: http://crbug.com/46578
   NOTIMPLEMENTED();
   return false;
 }
 
 void NPN_URLRedirectResponse(NPP instance, void* notify_data, NPBool allow) {
 }
 
 }  // extern "C"