Change V8VarConverter::FromV8Value to complete synchronously if possible

content/renderer/pepper/resource_converter.cc

 // Copyright 2013 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/pepper/resource_converter.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "content/public/renderer/renderer_ppapi_host.h"
 #include "content/renderer/pepper/pepper_file_system_host.h"
@@ skipping 248 matching lines @@
     *was_resource = true;
     return true;
   }
 
   // The value was not convertible to a resource. Return true with
   // |was_resource| set to false. As per the interface of FromV8Value, |result|
   // may be left unmodified in this case.
   return true;
 }
 
+void ResourceConverterImpl::Reset() {
+  browser_host_create_messages_.clear();
+  browser_vars_.clear();
+}
+
+bool ResourceConverterImpl::NeedsFlush() {
+  return !browser_host_create_messages_.empty();
+}
+
 void ResourceConverterImpl::Flush(const base::Callback<void(bool)>& callback) {
   host_->CreateBrowserResourceHosts(
       instance_,
       browser_host_create_messages_,
       base::Bind(&FlushComplete, callback, browser_vars_));
   browser_host_create_messages_.clear();
   browser_vars_.clear();
 }
 
 bool ResourceConverterImpl::ToV8Value(const PP_Var& var,
@@ skipping 56 matching lines @@
     const IPC::Message& create_message,
     const IPC::Message& browser_host_create_message) {
   scoped_refptr<HostResourceVar> result =
       CreateResourceVar(pending_renderer_id, create_message);
   browser_host_create_messages_.push_back(browser_host_create_message);
   browser_vars_.push_back(result);
   return result;
 }
 
 }  // namespace content