Add plumbing for WebThread::TaskObserver::willProcessTask()

webkit/glue/webthread_impl.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.
 
 // An implementation of WebThread in terms of base::MessageLoop and
 // base::Thread
 
 #include "webkit/glue/webthread_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop.h"
 #include "base/threading/platform_thread.h"
 
 namespace webkit_glue {
 
 WebThreadBase::WebThreadBase() { }
 WebThreadBase::~WebThreadBase() { }
 
 class WebThreadBase::TaskObserverAdapter : public MessageLoop::TaskObserver {
 public:
   TaskObserverAdapter(WebThread::TaskObserver* observer)
       : observer_(observer) { }
 
-  // WebThread::TaskObserver does not have a willProcessTask method.
-  virtual void WillProcessTask(base::TimeTicks) OVERRIDE { }
+  virtual void WillProcessTask(base::TimeTicks) OVERRIDE {
+    observer_->willProcessTask();
+  }
 
   virtual void DidProcessTask(base::TimeTicks) OVERRIDE {
     observer_->didProcessTask();
   }
 
 private:
   WebThread::TaskObserver* observer_;
 };
 
 void WebThreadBase::addTaskObserver(TaskObserver* observer) {
@@ skipping 84 matching lines @@
 }
 
 bool WebThreadImplForMessageLoop::IsCurrentThread() const {
   return message_loop_->BelongsToCurrentThread();
 }
 
 WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {
 }
 
 }