Move DeviceOrientation / DeviceMotion event handlers to device_orientation module

Move DeviceOrientation / DeviceMotion event handlers to device_orientation
module using partial IDL interfaces instead of editing Window.idl directly. This
is more modular.

R=abarth, timvolodine@chromium.org

Review URL: https://codereview.chromium.org/189413008

git-svn-id: svn://svn.chromium.org/blink/trunk@168787 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Don't do HiDPI scaling of accelerated filter params in Blink.

This puts HiDPI scaling of filter parameters behind a
compile-time flag (that is already enabled in Chrome). CC
will take care of DPR on the accelerated side in an upcoming
change, and FilterEffectRenderer will take care of it on the
raster side.

BUG=281516
R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/191053003

git-svn-id: svn://svn.chromium.org/blink/trunk@168788 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Do not suggest all_webkit to users.

all_webkit will be removed soon from Chromium and is just an alias to
blink_tests.

This was discussed in this thread:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/s3VeTNMy85M/Fjj76zoN3LkJ

And renamed here:
https://codereview.chromium.org/59233012

BUG=None
TEST=None
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/191973002

git-svn-id: svn://svn.chromium.org/blink/trunk@168789 bbb929c8-8fbe-4397-9dbb-9b2b20218538