Turn on useUnfortunateSynchronousResizeMode.

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 630 matching lines @@
 
   return RenderThread::Get()->Send(message);
 }
 
 void RenderWidget::Resize(const gfx::Size& new_size,
                           const gfx::Size& physical_backing_size,
                           float overdraw_bottom_height,
                           const gfx::Rect& resizer_rect,
                           bool is_fullscreen,
                           ResizeAck resize_ack) {
-  if (!resizing_mode_selector_->is_synchronous_mode()) {
+  if (resizing_mode_selector_->NeverUsesSynchronousResize()) {
     // A resize ack shouldn't be requested if we have not ACK'd the previous
     // one.
     DCHECK(resize_ack != SEND_RESIZE_ACK || !next_paint_is_resize_ack());
     DCHECK(resize_ack == SEND_RESIZE_ACK || resize_ack == NO_RESIZE_ACK);
   }
 
   // Ignore this during shutdown.
   if (!webwidget_)
     return;
 
@@ skipping 18 matching lines @@
 
     size_ = new_size;
 
     paint_aggregator_.ClearPendingUpdate();
 
     // When resizing, we want to wait to paint before ACK'ing the resize.  This
     // ensures that we only resize as fast as we can paint.  We only need to
     // send an ACK if we are resized to a non-empty rect.
     webwidget_->resize(new_size);
 
-    if (!resizing_mode_selector_->is_synchronous_mode()) {
+    if (resizing_mode_selector_->NeverUsesSynchronousResize()) {
       // Resize should have caused an invalidation of the entire view.
       DCHECK(new_size.IsEmpty() || is_accelerated_compositing_active_ ||
              paint_aggregator_.HasPendingUpdate());
     }
   } else if (!resizing_mode_selector_->is_synchronous_mode()) {
     resize_ack = NO_RESIZE_ACK;
   }
 
   if (new_size.IsEmpty() || physical_backing_size.IsEmpty()) {
     // For empty size or empty physical_backing_size, there is no next paint
@@ skipping 2134 matching lines @@
           GetURLForGraphicsContext3D(),
           gpu_channel_host.get(),
           swap_client,
           attributes,
           false /* bind generates resources */,
           limits));
   return context.Pass();
 }
 
 }  // namespace content