Add initial Blink-side support for the Screen Orientation API

LayoutTests/screen_orientation/locking-failure-expected.txt

Index: LayoutTests/screen_orientation/locking-failure-expected.txt
diff --git a/LayoutTests/screen_orientation/locking-failure-expected.txt b/LayoutTests/screen_orientation/locking-failure-expected.txt
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+++ b/LayoutTests/screen_orientation/locking-failure-expected.txt
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+Validates that screen.lockOrientation() returns false on bad input
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS screen.orientation is "portrait-primary"
+PASS screen.lockOrientation('invalid-orientation') is false
+PASS screen.orientation is "portrait-primary"
+PASS screen.lockOrientation() threw exception TypeError: Failed to execute 'lockOrientation' on 'Screen': 1 argument required, but only 0 present..
+PASS screen.orientation is "portrait-primary"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+