[Files.app Gallery] Prevent the placeholder from being visible in the delete message 

BUG=344269
TEST=manually tested

Review URL: https://codereview.chromium.org/185263007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254980 0039d316-1c4b-4281-b951-d872f2087c98
We need a function which can tell us whether the requested texture readback is supported or not. As of now ARGB888 is taken as the default format, this will pass until the browser surface config is ARGB8888, in low end mode we switch to 16 bit format surface if supported, then we may need this function.

Implement IsReadBackConfigSupported using map and clean up accordingly.

Bug=323150

Review URL: https://codereview.chromium.org/149123008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254981 0039d316-1c4b-4281-b951-d872f2087c98
Bump the GYP version to 1860

BUG=346703
R=mark@chromium.org

Review URL: https://codereview.chromium.org/183803019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254982 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254983 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254983