linux: work around "flash does not register any clicks" bug

chrome/plugin/plugin_thread.cc

 // 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_thread.h"
 
 #include "build/build_config.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 29 matching lines @@
         CommandLine::ForCurrentProcess()->argv();
     int argc = args.size();
     scoped_array<char *> argv(new char *[argc + 1]);
     for (size_t i = 0; i < args.size(); ++i) {
       // TODO(piman@google.com): can gtk_init modify argv? Just being safe
       // here.
       argv[i] = strdup(args[i].c_str());
     }
     argv[argc] = NULL;
     char **argv_pointer = argv.get();
+
+    // Flash has problems receiving clicks with newer GTKs due to the
+    // client-side windows change.  To be safe, we just always set the
+    // backwards-compat environment variable.
+    setenv("GDK_NATIVE_WINDOWS", "1", 1);
+
     gtk_init(&argc, &argv_pointer);
     for (size_t i = 0; i < args.size(); ++i) {
       free(argv[i]);
     }
   }
 #endif
 
   PatchNPNFunctions();
 
   // Preload the library to avoid loading, unloading then reloading
@@ skipping 178 matching lines @@
   }
 
   if (!result || net_error != net::OK)
     return false;
 
   *proxy_list = proxy_result;
   return true;
 }
 
 } // namespace webkit_glue