Canvas web view example

[tqtran7]

• Replaced onGUI with a canvas example that looks more like a web browser.
• Added a resize method that will adjust the web view to the canvas.
• Added unity event handlers so other components can hook into the events.
• Some additional code cleanup.

[KojiNakamaru]

Thank you for the contribution. Could you please also add a meta file? Without it, CanvasSample.unity cannot refer CanvasWebView.cs (and .gitignore should not have *.meta).

[rk042]

I try it but it's not rendering, can you please explain it?

[rk042]

• Replaced onGUI with a canvas example that looks more like a web browser.
• Added a resize method that will adjust the web view to the canvas.
• Added unity event handlers so other components can hook into the events.
• Some additional code cleanup.

How? I get nothing in my canvas panel.

[KojiNakamaru]

This pull request is incomplete as I discussed before. I fixed it in the following branch:
https://github.com/gree/unity-webview/tree/tqtran7-canvasWebview-with-some-fixes