Make RenderWidget send UpdateRect after auto-resize.

content/renderer/render_widget.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/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 66 matching lines @@
     : routing_id_(MSG_ROUTING_NONE),
       surface_id_(0),
       webwidget_(NULL),
       opener_id_(MSG_ROUTING_NONE),
       host_window_(0),
       host_window_set_(false),
       current_paint_buf_(NULL),
       next_paint_flags_(0),
       filtered_time_per_frame_(0.0f),
       update_reply_pending_(false),
+      need_update_rect_for_auto_resize_(false),
       using_asynchronous_swapbuffers_(false),
       num_swapbuffers_complete_pending_(0),
       did_show_(false),
       is_hidden_(false),
       is_fullscreen_(false),
       needs_repainting_on_restore_(false),
       has_focus_(false),
       handling_input_event_(false),
       closing_(false),
       is_swapped_out_(swapped_out),
@@ skipping 813 matching lines @@
   pending_update_params_.reset(new ViewHostMsg_UpdateRect_Params);
   pending_update_params_->dx = update.scroll_delta.x();
   pending_update_params_->dy = update.scroll_delta.y();
   pending_update_params_->scroll_rect = update.scroll_rect;
   pending_update_params_->view_size = size_;
   pending_update_params_->plugin_window_moves.swap(plugin_window_moves_);
   pending_update_params_->flags = next_paint_flags_;
   pending_update_params_->scroll_offset = GetScrollOffset();
   pending_update_params_->needs_ack = true;
   next_paint_flags_ = 0;
+  need_update_rect_for_auto_resize_ = false;
 
   if (update.scroll_rect.IsEmpty() &&
       !is_accelerated_compositing_active_ &&
       GetBitmapForOptimizedPluginPaint(bounds, &dib, &optimized_copy_location,
                                        &optimized_copy_rect)) {
     // Only update the part of the plugin that actually changed.
     optimized_copy_rect = optimized_copy_rect.Intersect(bounds);
     pending_update_params_->bitmap = dib->id();
     pending_update_params_->bitmap_rect = optimized_copy_location;
     pending_update_params_->copy_rects.push_back(optimized_copy_rect);
@@ skipping 140 matching lines @@
   // 1) Ensures that we call WebView::Paint without a bunch of other junk
   //    on the call stack.
   // 2) Allows us to collect more damage rects before painting to help coalesce
   //    the work that we will need to do.
   invalidation_task_posted_ = true;
   MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&RenderWidget::InvalidationCallback, this));
 }
 
 void RenderWidget::didAutoResize(const WebSize& new_size) {
-  size_ = new_size;
+  if (size_.width() != new_size.width || size_.height() != new_size.height) {
+    size_ = new_size;
+    need_update_rect_for_auto_resize_ = true;
+  }
 }
 
 void RenderWidget::didActivateCompositor(int input_handler_identifier) {
   TRACE_EVENT0("gpu", "RenderWidget::didActivateCompositor");
 
 #if !defined(OS_MACOSX)
   if (!is_accelerated_compositing_active_) {
     // When not in accelerated compositing mode, in certain cases (e.g. waiting
     // for a resize or if no backing store) the RenderWidgetHost is blocking the
     // browser's UI thread for some time, waiting for an UpdateRect. If we are
@@ skipping 51 matching lines @@
   // Notify subclasses that we initiated the paint operation.
   DidInitiatePaint();
 }
 
 void RenderWidget::didCompleteSwapBuffers() {
   DidFlushPaint();
 
   if (update_reply_pending_)
     return;
 
-  if (!next_paint_flags_ && !plugin_window_moves_.size())
+  if (!next_paint_flags_ &&
+      !need_update_rect_for_auto_resize_ &&
+      !plugin_window_moves_.size()) {
     return;
+  }
 
   ViewHostMsg_UpdateRect_Params params;
   params.view_size = size_;
   params.plugin_window_moves.swap(plugin_window_moves_);
   params.flags = next_paint_flags_;
   params.scroll_offset = GetScrollOffset();
   params.needs_ack = false;
 
   Send(new ViewHostMsg_UpdateRect(routing_id_, params));
   next_paint_flags_ = 0;
+  need_update_rect_for_auto_resize_ = false;
 }
 
 void RenderWidget::scheduleComposite() {
   if (WebWidgetHandlesCompositorScheduling()) {
     webwidget_->composite(false);
   } else {
     // TODO(nduca): replace with something a little less hacky.  The reason this
     // hack is still used is because the Invalidate-DoDeferredUpdate loop
     // contains a lot of host-renderer synchronization logic that is still
     // important for the accelerated compositing case. The option of simply
@@ skipping 532 matching lines @@
   }
 }
 
 bool RenderWidget::WillHandleMouseEvent(const WebKit::WebMouseEvent& event) {
   return false;
 }
 
 bool RenderWidget::WebWidgetHandlesCompositorScheduling() const {
   return false;
 }