Adds kind-of-live thumbnail generation for a potential tab switcher.

chrome/common/notification_type.h

 // 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.
 
 #ifndef CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 268 matching lines @@
     // This notification is sent when a TabContents is being hidden, e.g. due
     // to switching away from this tab.  The source is a Source<TabContents>.
     TAB_CONTENTS_HIDDEN,
 
     // This notification is sent when a TabContents is being destroyed. Any
     // object holding a reference to a TabContents can listen to that
     // notification to properly reset the reference. The source is a
     // Source<TabContents>.
     TAB_CONTENTS_DESTROYED,
 
+    // A RenderViewHost was created for a TabContents. The source is the
+    // RenderViewHostManager who owns it, and the details is the RenderViewHost
+    // pointer. Note that the source will be NULL in some cases for testing,
+    // when there is no RVHManager.
+    RENDER_VIEW_HOST_CREATED_FOR_TAB,
+
     // Stuff inside the tabs ---------------------------------------------------
 
     // This message is sent after a constrained window has been closed.  The
     // source is a Source<ConstrainedWindow> with a pointer to the closed child
     // window.  (The pointer isn't usable, except for identification.) No
     // details are expected.
     CWINDOW_CLOSED,
 
     // Indicates that a RenderProcessHost is destructing. The source will be the
     // RenderProcessHost that corresponds to the process.
@@ skipping 20 matching lines @@
     // This is sent to notify that the RenderViewHost displayed in a
     // TabContents has changed.  Source is the TabContents for which the change
     // happened, details is the previous RenderViewHost (can be NULL when the
     // first RenderViewHost is set).
     RENDER_VIEW_HOST_CHANGED,
 
     // This is sent when a RenderWidgetHost is being destroyed. The source is
     // the RenderWidgetHost, the details are not used.
     RENDER_WIDGET_HOST_DESTROYED,
 
+    // Indicates a RenderWidgetHost has been hidden or restored. The source is
+    // the RWH whose visibility changed, the details is a bool set to true if
+    // the new state is "visible."
+    RENDER_WIDGET_VISIBILITY_CHANGED,
+
     // Notification from TabContents that we have received a response from the
     // renderer after using the dom inspector.
     DOM_INSPECT_ELEMENT_RESPONSE,
 
     // Notification from TabContents that we have received a response from the
     // renderer in response to a dom automation controller action.
     DOM_OPERATION_RESPONSE,
 
     // Sent when the bookmark bubble hides. The source is the profile, the
     // details unused.
@@ skipping 261 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_