Support getEntryId for entries passed to apps as launch data.

Previously, chrome.fileSystem.getEntryId only supported entries returned
by chrome.fileSystem.chooseEntry. This adds support for entries passed
to apps in launchData for chrome.app.runtime.onLaunched events.

BUG=None

Review URL: https://chromiumcodereview.appspot.com/14912009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199693 0039d316-1c4b-4281-b951-d872f2087c98
16 files changed