Reland r59093008 "Add logging capability to CDM adapter".

Fixed widevine_cdm.gyp.

Original CL description:

The CDM adapter is a pepper plugin and it should not depend on base/. Therefore
we cannot use base/logging.h directly. Instead, add CDM_DLOG, which is a
simplified version of it.

Also add CdmAdapter::ConsoleLog() for JS console logs.

BUG=320065,328486
TEST=Log works on Linux.
R=dalecurtis@chromium.org, ddorwin@chromium.org
TBR=dalecurtis@chromium.org, ddorwin@chromium.org

Review URL: https://codereview.chromium.org/100413006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240944 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240944