CL: https://codereview.chromium.org/2228873002

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0f782e18ab076cd108a9a63a12a97c4703f125f0

commit 0f782e18ab076cd108a9a63a12a97c4703f125f0
Author: mgiuca <mgiuca@chromium.org>
Date: Fri Sep 02 03:29:52 2016

Added an origin trial for WebShare.

This allows sites to register for a token to use navigator.share for a
limited time (for API experimentation purposes only).

BUG= 635805 

Review-Url: https://codereview.chromium.org/2228873002
Cr-Commit-Position: refs/heads/master@{#416179}

[modify] https://crrev.com/0f782e18ab076cd108a9a63a12a97c4703f125f0/third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp
[modify] https://crrev.com/0f782e18ab076cd108a9a63a12a97c4703f125f0/third_party/WebKit/Source/bindings/modules/v8/V8BindingForModules.cpp
[modify] https://crrev.com/0f782e18ab076cd108a9a63a12a97c4703f125f0/third_party/WebKit/Source/modules/webshare/NavigatorShare.idl
[modify] https://crrev.com/0f782e18ab076cd108a9a63a12a97c4703f125f0/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.in