[chromedriver] Use center of first ClientRect when moving mouse to an element.

chrome/test/chromedriver/element_commands.cc

 // Copyright (c) 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 "chrome/test/chromedriver/element_commands.h"
 
 #include <cmath>
 #include <list>
 #include <vector>
 
@@ skipping 427 matching lines @@
 }
 
 Status ExecuteGetElementLocationOnceScrolledIntoView(
     Session* session,
     WebView* web_view,
     const std::string& element_id,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value) {
   WebPoint location;
   Status status = ScrollElementIntoView(
-      session, web_view, element_id, &location);
+      session, web_view, element_id, nullptr, &location);
   if (status.IsError())
     return status;
   value->reset(CreateValueFrom(location));
   return Status(kOk);
 }
 
 Status ExecuteGetElementSize(
     Session* session,
     WebView* web_view,
     const std::string& element_id,
@@ skipping 43 matching lines @@
     WebView* web_view,
     const std::string& element_id,
     const base::DictionaryValue& params,
     scoped_ptr<base::Value>* value) {
   std::string other_element_id;
   if (!params.GetString("other", &other_element_id))
     return Status(kUnknownError, "'other' must be a string");
   value->reset(new base::FundamentalValue(element_id == other_element_id));
   return Status(kOk);
 }