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

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.*

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=53317

[hans, 2010-07-20 14:07:34]

This CL depends on the patch in https://bugs.webkit.org/show_bug.cgi?id=42265.

[bulach, 2010-07-20 14:38:56]

LGTM

http://codereview.chromium.org/3042009/diff/1/9
File chrome/test/data/device_orientation/enable_switch_test.html (right):

http://codereview.chromium.org/3042009/diff/1/9#newcode10
chrome/test/data/device_orientation/enable_switch_test.html:10:
document.location = '#pass';
nice trick!