Support window.opener after a process swap.

content/renderer/render_widget.cc

 // Copyright (c) 2011 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/renderer/render_widget.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 54 matching lines @@
       host_window_(0),
       current_paint_buf_(NULL),
       next_paint_flags_(0),
       update_reply_pending_(false),
       did_show_(false),
       is_hidden_(false),
       needs_repainting_on_restore_(false),
       has_focus_(false),
       handling_input_event_(false),
       closing_(false),
+      is_swapped_out_(false),
       input_method_is_active_(false),
       text_input_type_(WebKit::WebTextInputTypeNone),
       popup_type_(popup_type),
       pending_window_rect_count_(0),
       suppress_next_char_events_(false),
       is_accelerated_compositing_active_(false),
       animation_update_pending_(false),
       animation_task_posted_(false) {
   RenderProcess::current()->AddRefProcess();
   DCHECK(render_thread_);
 }
 
 RenderWidget::~RenderWidget() {
   DCHECK(!webwidget_) << "Leaking our WebWidget!";
   if (current_paint_buf_) {
     RenderProcess::current()->ReleaseTransportDIB(current_paint_buf_);
     current_paint_buf_ = NULL;
   }
-  RenderProcess::current()->ReleaseProcess();
+  // If we are swapped out, we have released already.
+  if (!is_swapped_out_)
+    RenderProcess::current()->ReleaseProcess();
 }
 
 // static
 RenderWidget* RenderWidget::Create(int32 opener_id,
                                    RenderThreadBase* render_thread,
                                    WebKit::WebPopupType popup_type) {
   DCHECK(opener_id != MSG_ROUTING_NONE);
   scoped_refptr<RenderWidget> widget(new RenderWidget(render_thread,
                                                         popup_type));
   widget->Init(opener_id);  // adds reference
@@ skipping 47 matching lines @@
 void RenderWidget::CompleteInit(gfx::NativeViewId parent_hwnd,
                                 gfx::PluginWindowHandle compositing_surface) {
   DCHECK(routing_id_ != MSG_ROUTING_NONE);
 
   host_window_ = parent_hwnd;
   compositing_surface_ = compositing_surface;
 
   Send(new ViewHostMsg_RenderViewReady(routing_id_));
 }
 
+void RenderWidget::SetSwappedOut(bool is_swapped_out) {
+  // We should only toggle between states.
+  DCHECK(is_swapped_out_ != is_swapped_out);
+  is_swapped_out_ = is_swapped_out;
+
+  // If we are swapping out, we will call ReleaseProcess, allowing the process
+  // to exit if all of its RenderViews are swapped out.  We wait until the
+  // WasSwappedOut call to do this, to avoid showing the sad tab.
+  // If we are swapping in, we call AddRefProcess to prevent the process from
+  // exiting.
+  if (!is_swapped_out)
+    RenderProcess::current()->AddRefProcess();
+}
+
 bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)
     IPC_MESSAGE_HANDLER(ViewMsg_Close, OnClose)
     IPC_MESSAGE_HANDLER(ViewMsg_CreatingNew_ACK, OnCreatingNewAck)
     IPC_MESSAGE_HANDLER(ViewMsg_Resize, OnResize)
     IPC_MESSAGE_HANDLER(ViewMsg_WasHidden, OnWasHidden)
     IPC_MESSAGE_HANDLER(ViewMsg_WasRestored, OnWasRestored)
+    IPC_MESSAGE_HANDLER(ViewMsg_WasSwappedOut, OnWasSwappedOut)
     IPC_MESSAGE_HANDLER(ViewMsg_UpdateRect_ACK, OnUpdateRectAck)
     IPC_MESSAGE_HANDLER(ViewMsg_HandleInputEvent, OnHandleInputEvent)
     IPC_MESSAGE_HANDLER(ViewMsg_MouseCaptureLost, OnMouseCaptureLost)
     IPC_MESSAGE_HANDLER(ViewMsg_SetFocus, OnSetFocus)
     IPC_MESSAGE_HANDLER(ViewMsg_SetInputMethodActive, OnSetInputMethodActive)
     IPC_MESSAGE_HANDLER(ViewMsg_ImeSetComposition, OnImeSetComposition)
     IPC_MESSAGE_HANDLER(ViewMsg_ImeConfirmComposition, OnImeConfirmComposition)
     IPC_MESSAGE_HANDLER(ViewMsg_PaintAtSize, OnMsgPaintAtSize)
     IPC_MESSAGE_HANDLER(ViewMsg_Repaint, OnMsgRepaint)
     IPC_MESSAGE_HANDLER(ViewMsg_SetTextDirection, OnSetTextDirection)
@@ skipping 111 matching lines @@
   set_next_paint_is_restore_ack();
 
   // Generate a full repaint.
   if (!is_accelerated_compositing_active_) {
     didInvalidateRect(gfx::Rect(size_.width(), size_.height()));
   } else {
     scheduleComposite();
   }
 }
 
+void RenderWidget::OnWasSwappedOut() {
+  // If we have been swapped out and no one else is using this process,
+  // it's safe to exit now.  If we get swapped back in, we will call
+  // AddRefProcess in SetSwappedOut.
+  if (is_swapped_out_)
+    RenderProcess::current()->ReleaseProcess();
+}
+
 void RenderWidget::OnRequestMoveAck() {
   DCHECK(pending_window_rect_count_);
   pending_window_rect_count_--;
 }
 
 void RenderWidget::OnUpdateRectAck() {
   GPU_TRACE_EVENT0("renderer", "RenderWidget::OnUpdateRectAck");
   DCHECK(update_reply_pending());
   update_reply_pending_ = false;
 
@@ skipping 802 matching lines @@
 
 void RenderWidget::CleanupWindowInPluginMoves(gfx::PluginWindowHandle window) {
   for (WebPluginGeometryVector::iterator i = plugin_window_moves_.begin();
        i != plugin_window_moves_.end(); ++i) {
     if (i->window == window) {
       plugin_window_moves_.erase(i);
       break;
     }
   }
 }