The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0

commit 28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0
Author: xidachen <xidachen@chromium.org>
Date: Mon Dec 05 17:52:15 2016

Expose isPointInPath and isPointInStroke for OffscreenCanvas 2D

The implementation is already there, we just need to expose the APIs.
This CL also adds layout tests to confirm the APIs' behavior.

BUG= 670860 

Review-Url: https://codereview.chromium.org/2548003002
Cr-Commit-Position: refs/heads/master@{#436342}

[add] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-2d-isPointInPath-isPointInStroke.html
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/virtual/service-worker-navigation-preload/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-dedicated-worker-expected.txt
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-expected.txt
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/LayoutTests/webexposed/global-interface-listing-shared-worker-expected.txt
[modify] https://crrev.com/28b6bf098c8c5fcb7f75568be3c66e0d2a24a4d0/third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.idl