Make sandboxed Flash work under UIPI

content/browser/plugin_process_host.cc

Index: content/browser/plugin_process_host.cc
===================================================================
--- content/browser/plugin_process_host.cc	(revision 87939)
+++ content/browser/plugin_process_host.cc	(working copy)
@@ -30,6 +30,7 @@
 #include "content/browser/renderer_host/resource_message_filter.h"
 #include "content/common/plugin_messages.h"
 #include "content/common/resource_messages.h"
+#include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 #include "ipc/ipc_switches.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/native_widget_types.h"
@@ -62,6 +63,24 @@
   plugin_parent_windows_set_.insert(window);
 }
 
+void PluginProcessHost::OnReparentPluginWindow(HWND window, HWND parent) {
+  DWORD process_id = 0;
+
+  // Reparent only to our process.
+  ::GetWindowThreadProcessId(parent, &process_id);
+  if (process_id != ::GetCurrentProcessId())
+    return;
+
+    // Must reparent before changing style.
+  ::SetParent(window, parent);
+
+  if (webkit::npapi::WebPluginDelegateImpl::IsDummyActivationWindow(window)) {
+    ::SetWindowLongPtr(window, GWL_STYLE, WS_CHILD);
+  } else {
+    ::SetWindowLongPtr(window, GWL_STYLE, WS_CHILD | WS_CLIPCHILDREN |
+                       WS_CLIPSIBLINGS);
+  }
+}
 #endif  // defined(OS_WIN)
 
 #if defined(TOOLKIT_USES_GTK)
@@ -245,6 +264,8 @@
 #if defined(OS_WIN)
     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_PluginWindowDestroyed,
                         OnPluginWindowDestroyed)
+    IPC_MESSAGE_HANDLER(PluginProcessHostMsg_ReparentPluginWindow,
+                        OnReparentPluginWindow)
 #endif
 #if defined(TOOLKIT_USES_GTK)
     IPC_MESSAGE_HANDLER(PluginProcessHostMsg_MapNativeViewId,