Bug 972210 - (Part I) Stop exposing inputContext to IMEs
Bug 972210 - (Part II) Have Pinyin and Zhuyin responsive to selectionchange
Bug 972210 - (Part III) Move JSPinyin unit test to it's right place
Bug 972210 - (Part IV) Move Latin script tests to it's right place
Merge pull request #22970 from timdream/keyboard-inputcontext-events

Bug 972210 - Have Pinyin and Zhuyin responsive to selectionchange, r=rudyl