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Allow component IME extensions use app.window and add 'ime' boolean in CreateWindowOptions for app window

To create an IME window, an IME must be whitelisted, must have app.window.ime permission and must use set 'ime' and 'frame' this way:
chrome.app.window.create(url, {
  'ime': true,
  'frame': 'none
}, function() {})
Note only whitelisted component IME extensions can use this boolean parameter. See doc here: https://docs.google.com/a/google.com/document/d/1JQHpLu_RjN8C1Yi0i_eApS5SZtPoMDqvlq06YOwXCFU/edit

BUG=401984

Review URL: https://codereview.chromium.org/503383002

Cr-Commit-Position: refs/heads/master@{#297163}