Refactor RenderWidgetHost::set_paint_observer()

chrome/common/notification_type.h

 // Copyright (c) 2010 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_
 #pragma once
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
@@ skipping 426 matching lines @@
 
     // Indicates that the render view host has received an accessibility tree
     // update, either partial or full, from the render view.  The source is the
     // RenderViewHost, the details are not used.
     RENDER_VIEW_HOST_ACCESSIBILITY_TREE_UPDATED,
 
     // This is sent when a RenderWidgetHost is being destroyed. The source is
     // the RenderWidgetHost, the details are not used.
     RENDER_WIDGET_HOST_DESTROYED,
 
+    // Sent when the widget is about to paint. The source is the
+    // RenderWidgetHost, the details are not used.
+    RENDER_WIDGET_HOST_WILL_PAINT,
+
+    // Sent after the widget has painted. The source is the RenderWidgetHost,
+    // the details are not used.
+    RENDER_WIDGET_HOST_DID_PAINT,
+
+    // Indicates the RenderWidgetHost is about to destroy the backing store. The
+    // backing store will still be valid when this call is made. The source is
+    // the RenderWidgetHost, the details is the BackingStore.
+    RENDER_WIDGET_HOST_WILL_DESTROY_BACKING_STORE,
+
+    // Indicates that the RenderWidgetHost just updated the backing store. The
+    // source is the RenderWidgetHost, the details are not used.
+    RENDER_WIDGET_HOST_DID_UPDATE_BACKING_STORE,
+
+    // This notifies the observer that a PaintAtSizeACK was received. The source
+    // is the RenderWidgetHost, the details are an instance of
+    // RenderWidgetHost::PaintAtSizeAckDetails.
+    RENDER_WIDGET_HOST_DID_RECEIVE_PAINT_AT_SIZE_ACK,
+
     // Sent from ~RenderViewHost. The source is the TabContents.
     RENDER_VIEW_HOST_DELETED,
 
     // Sent from RenderViewHost::ClosePage.  The hosted RenderView has
     // processed the onbeforeunload handler and is about to be sent a
     // ViewMsg_ClosePage message to complete the tear-down process.  The source
     // is the RenderViewHost sending the message, and no details are provided.
     // Note:  This message is not sent in response to RenderView closure
     // initiated by window.close().
     RENDER_VIEW_HOST_WILL_CLOSE_RENDER_VIEW,
@@ skipping 857 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_