Disallow UI/IO thread blocking on any other thread.

content/browser/renderer_host/render_widget_helper.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/browser/renderer_host/render_widget_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/eintr_wrapper.h"
 #include "base/threading/thread.h"
+#include "base/threading/thread_restrictions.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/resource_dispatcher_host_impl.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 using content::RenderViewHostImpl;
 using content::ResourceDispatcherHostImpl;
@@ skipping 120 matching lines @@
       DCHECK(msg->routing_id() == render_widget_id);
       return true;
     }
 
     // Calculate the maximum amount of time that we are willing to sleep.
     base::TimeDelta max_sleep_time =
         max_delay - (base::TimeTicks::Now() - time_start);
     if (max_sleep_time <= base::TimeDelta::FromMilliseconds(0))
       break;
 
+    base::ThreadRestrictions::ScopedAllowWait allow_wait;
     event_.TimedWait(max_sleep_time);
   }
 
   return false;
 }
 
 void RenderWidgetHelper::DidReceiveUpdateMsg(const IPC::Message& msg) {
   int render_widget_id = msg.routing_id();
 
   UpdateMsgProxy* proxy = new UpdateMsgProxy(this, msg);
@@ skipping 195 matching lines @@
 void RenderWidgetHelper::ClearAllocatedDIBs() {
   for (std::map<TransportDIB::Id, int>::iterator
        i = allocated_dibs_.begin(); i != allocated_dibs_.end(); ++i) {
     if (HANDLE_EINTR(close(i->second)) < 0)
       PLOG(ERROR) << "close: " << i->first;
   }
 
   allocated_dibs_.clear();
 }
 #endif