gpu: [Android] Use 1MB as the MappedMemoryManager chunk size instead of 2MB for low-end devices.

Landing with notry since this change only affects Android and Android trybots are green.

NOTRY=true

BUG=297844

Review URL: https://chromiumcodereview.appspot.com/24445002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225204 0039d316-1c4b-4281-b951-d872f2087c98
Add media/cdm/ppapi/api to .gitignore.

Looks like this was added to DEPS in r216826.

TBR=dalecurtis@chromium.org

Review URL: https://codereview.chromium.org/24489004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225205 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225204
SVN changes up to revision 225205