Fix the mac hangup when force-compositing-mode is enabled

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2011 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 <QuartzCore/QuartzCore.h>
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 826 matching lines @@
   // |is_accelerated_compositing_active()| is flipped when the compositor output
   // should be shown/hidden.
   // Show/hide the view belonging to the compositor here.
   plugin_container_manager_.set_gpu_rendering_active(show_gpu_widget);
 
   gfx::PluginWindowHandle root_handle =
       plugin_container_manager_.root_container_handle();
   if (root_handle != gfx::kNullPluginWindow) {
     AcceleratedPluginView* view = ViewForPluginWindowHandle(root_handle);
     DCHECK(view);
+    [view setViewForGL];
     bool visible =
         plugin_container_manager_.SurfaceShouldBeVisible(root_handle);
     [[view window] disableScreenUpdatesUntilFlush];
     [view setHidden:!visible];
   }
 }
 
 void RenderWidgetHostViewMac::HandleDelayedGpuViewHiding() {
   if (needs_gpu_visibility_update_after_repaint_) {
     UpdateRootGpuViewVisibility(false);
@@ skipping 1724 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end