Download and store large favicon for Android.

BUG=298446

Review URL: https://codereview.chromium.org/28943004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231074 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231074
GTTF: Make EmbeddedTestServer always use its own thread for IO

Otherwise we likely end up blocking the browser's IO thread,
especially with big responses that don't fit in the kernel
buffer. This blocks EmbeddedTestServer's IO thread,
and if it's also the browser's IO thread the browser can't
consume the response resulting in a hang.

BUG=310713
R=jam@chromium.org, rch@chromium.org

Review URL: https://codereview.chromium.org/37683004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231075 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231075