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

webkit/glue/webthread_impl.cc

Index: webkit/glue/webthread_impl.cc
diff --git a/webkit/glue/webthread_impl.cc b/webkit/glue/webthread_impl.cc
index 4725fa158dfc46793f46f265839a0f7a18b2d5ab..3ef349710aed3434397300f6af2f693a0b521460 100644
--- a/webkit/glue/webthread_impl.cc
+++ b/webkit/glue/webthread_impl.cc
@@ -22,8 +22,9 @@ 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();