added setX/setY method for Point class

Author: nataliakoval

inc/webdriver_basic_types.h

@@ -40,6 +40,8 @@ class Point {
     ~Point();
 
     void Offset(double x, double y);
+    void setX(double x);
+    void setY(double y);
 
     double x() const;
     double y() const;

src/webdriver/webdriver_basic_types.cc

@@ -23,6 +23,14 @@ void Point::Offset(double x, double y) {
   	y_ += y;
 }
 
+void Point::setX(double x) {
+    x_ = x;
+}
+
+void Point::setY(double y) {
+    y_ = y;
+}
+
 double Point::x() const {
   	return x_;
 }