[chromedriver] Support clicking an element in sub frames.

chrome/test/chromedriver/basic_types.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/basic_types.h"
 
 WebPoint::WebPoint() : x(0), y(0) {}
 
 WebPoint::WebPoint(int x, int y) : x(x), y(y) {}
 
 WebPoint::~WebPoint() {}
 
-void WebPoint::offset(int x_, int y_) {
+void WebPoint::Offset(int x_, int y_) {
   x += x_;
   y += y_;
 }
 
 WebSize::WebSize() : width(0), height(0) {}
 
 WebSize::WebSize(int width, int height) : width(width), height(height) {}
 
 WebSize::~WebSize() {}
 
 WebRect::WebRect() : origin(0, 0), size(0, 0) {}
 
 WebRect::WebRect(int x, int y, int width, int height)
     : origin(x, y), size(width, height) {}
 
 WebRect::WebRect(const WebPoint& origin, const WebSize& size)
     : origin(origin), size(size) {}
 
 WebRect::~WebRect() {}
 
-int WebRect::x() { return origin.x; }
+int WebRect::X() const { return origin.x; }
 
-int WebRect::y() { return origin.y; }
+int WebRect::Y() const { return origin.y; }
 
-int WebRect::width() { return size.width; }
+int WebRect::Width() const { return size.width; }
 
-int WebRect::height() { return size.height; }
+int WebRect::Height() const { return size.height; }