GTK Render Widget Host View resets cached center location on mouse lock.

content/browser/renderer_host/render_widget_host_view_gtk.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/browser/renderer_host/render_widget_host_view_gtk.h"
 
 // If this gets included after the gtk headers, then a bunch of compiler
 // errors happen because of a "#define Status int" in Xlib.h, which interacts
 // badly with net::URLRequestStatus::Status.
 #include "content/common/view_messages.h"
@@ skipping 189 matching lines @@
     // control the lifetime of, auto disconnecting at our end of our life.
     host_view->signals_.Connect(gtk_widget_get_toplevel(widget),
                                 "configure-event",
                                 G_CALLBACK(OnConfigureEvent), host_view);
     return FALSE;
   }
 
   static gboolean OnConfigureEvent(GtkWidget* widget,
                                    GdkEventConfigure* event,
                                    RenderWidgetHostViewGtk* host_view) {
-    host_view->widget_center_valid_ = false;
-    host_view->mouse_has_been_warped_to_new_center_ = false;
+    host_view->MarkCachedWidgetCenterStale();
     return FALSE;
   }
 
   static gboolean OnKeyPressReleaseEvent(GtkWidget* widget,
                                          GdkEventKey* event,
                                          RenderWidgetHostViewGtk* host_view) {
     // Force popups or fullscreen windows to close on Escape so they won't keep
     // the keyboard grabbed or be stuck onscreen if the renderer is hanging.
     bool should_close_on_escape =
         (host_view->IsPopup() && host_view->NeedsInputGrab()) ||
@@ skipping 1059 matching lines @@
   if (grab_status != GDK_GRAB_SUCCESS) {
     LOG(WARNING) << "Failed to grab pointer for LockMouse. "
                  << "gdk_pointer_grab returned: " << grab_status;
     mouse_locked_ = false;
     return false;
   }
 
   // Clear the tooltip window.
   SetTooltipText(string16());
 
+  // Ensure that the widget center location will be relevant for this mouse
+  // lock session. It is updated whenever the window geometry moves
+  // but may be out of date due to switching tabs.
+  MarkCachedWidgetCenterStale();
+
   return true;
 }
 
 void RenderWidgetHostViewGtk::UnlockMouse() {
   if (!mouse_locked_)
     return;
 
   mouse_locked_ = false;
 
   GtkWidget* widget = view_.get();
@@ skipping 57 matching lines @@
     temp = reinterpret_cast<GdkEventButton*>(
         gdk_event_copy(reinterpret_cast<GdkEvent*>(event)));
   }
 
   if (last_mouse_down_)
     gdk_event_free(reinterpret_cast<GdkEvent*>(last_mouse_down_));
 
   last_mouse_down_ = temp;
 }
 
+void RenderWidgetHostViewGtk::MarkCachedWidgetCenterStale() {
+  widget_center_valid_ = false;
+  mouse_has_been_warped_to_new_center_ = false;
+}
+
 gfx::Point RenderWidgetHostViewGtk::GetWidgetCenter() {
   if (widget_center_valid_)
     return widget_center_;
 
   GdkWindow* window = gtk_widget_get_window(view_.get());
   gint window_x = 0;
   gint window_y = 0;
   gdk_window_get_origin(window, &window_x, &window_y);
   gint window_w = gdk_window_get_width(window);
   gint window_h = gdk_window_get_height(window);
@@ skipping 106 matching lines @@
     browser_accessibility_manager_.reset(
         BrowserAccessibilityManager::CreateEmptyDocument(
             parent, static_cast<WebAccessibility::State>(0), this));
   }
   BrowserAccessibilityGtk* root =
       browser_accessibility_manager_->GetRoot()->ToBrowserAccessibilityGtk();
 
   atk_object_set_role(root->GetAtkObject(), ATK_ROLE_HTML_CONTAINER);
   return root->GetAtkObject();
 }