[OS X] Wire up --use-mock-keychain command line flag to encryptor module

Respect --use-mock-keychain command line flag in encryptor module, also pass this flag when running Chrome via Telemetry.

BUG=344318,339149
R=jochen@chromium.org, joi@chromium.org, marja@chromium.org, tonyg@chromium.org

Review URL: https://codereview.chromium.org/176583002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253162 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253162
Added tests to idl parsing of extensions API IDL.

Added tests specifically for testing object types, and optional
properties in object types.

BUG=None

Review URL: https://codereview.chromium.org/177193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253163 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253163