[MediaGalleries] Initial iPhoto gallery detection support.

R=tommycli@chromium.org, vandebo@chromium.org
BUG=151703

Review URL: https://codereview.chromium.org/24363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225738 0039d316-1c4b-4281-b951-d872f2087c98
NaCl: Remove FileDownloader::URLBufferStartNotify.

This function is exactly the same as FileDownloader::URLLoadStartNotify;
there's no need to have both in FileDownloader. I came across this while
changing the internals of FileDownloader::Open.

BUG=
R=dmichael@chromium.org

Review URL: https://codereview.chromium.org/25096002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225739 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225739
[chromedriver] Provide better error messages when managing devices.

Previously, there was ambiguity whether a device was offline or in use.

BUG=
R=craigdh@chromium.org

Review URL: https://codereview.chromium.org/24817002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225740 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225740