Remove getContext() from WindowAndroid in favor of getActivity()

BUG=341231
NOTRY=true

Review URL: https://codereview.chromium.org/178193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253199 0039d316-1c4b-4281-b951-d872f2087c98
Enable folder feature for app launcher by default.

BUG=345097
R=abodenha@chromium.org, skuhne@chromium.org, xiyuan@chromium.org, zea@chromium.org

Review URL: https://codereview.chromium.org/174243004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253200 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253200
GLInProcessContext: Implement global sync points

Replaces the implementation that relied on flush ordering since that
is not guaranteed when running different service threads.

NOTRY=True
BUG=332146

Review URL: https://codereview.chromium.org/168183003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253201 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253201