Prevent default mouse event on Canvas element to prevent browsers from marking text (and Chrome from displaying the "text" cursor).
Prevent default mouse event on Canvas element to prevent browsers from marking text (and Chrome from displaying the "text" cursor).

git-svn-id: 79cef5a5a257cc9dbe40a45ac190115b4780e2d0@1532627 13f79535-47bb-0310-9956-ffa450edef68

apache/tomcat,apache/tomcat,apache/tomcat,Nickname0806/Test_Q4,apache/tomcat,Nickname0806/Test_Q4,Nickname0806/Test_Q4,apache/tomcat,Nickname0806/Test_Q4