[Dart] MouseEvent ClientX and ClientY Deprecated

Recently I am porting JavaScript code to Dart. When I write the following code:

int dx = e.clientX - initialMouseX;

It works on Dartium. Then I compiled the code to JavaScript by dart2js. The compiled JavaScript code failed to run on Chromium. After some Googling, I found Dart MouseEvent clientX and clientY deprecated ([1], [2], [4]). And I also found someone got the same problem as me ([3]). The correct way to get clientX and clientY in Dart should be:

int dx = e.client.x - initialMouseX;

Then the compiled JavaScript code runs on Chromium without trouble.

PS: Tested on Dart 1.8

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