Add --enable-device-orientation switch and set ENABLE_DEVICE_ORIENTATION=1

Flip the compile-time enable switch for device orientation to on,
and add a command-line switch to put the functionality behind.

The command-line flag will be used both on the Chromium side,
and in WebKit via WebRuntimeFeatures.

BUG=44654
TEST=browser_tests --gtest_filter=DeviceOrientationEnableSwitchTest.*

Review URL: http://codereview.chromium.org/3042009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53317 0039d316-1c4b-4281-b951-d872f2087c98
8 files changed