Add initial Blink-side support for the Screen Orientation API

Source/web/WebScreenOrientationController.cpp

Index: Source/web/WebScreenOrientationController.cpp
diff --git a/Source/web/WebScreenOrientationController.cpp b/Source/web/WebScreenOrientationController.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6ffa0775db7242429e4d4c4501a5c3b814092bd7
--- /dev/null
+++ b/Source/web/WebScreenOrientationController.cpp
@@ -0,0 +1,23 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "WebScreenOrientationController.h"
+
+#include "modules/screen_orientation/ScreenOrientationController.h"
+
+namespace blink {
+
+// Make sure WebScreenOrientation stays in sync with WebCore::ScreenOrientationValue.
+COMPILE_ASSERT(WebScreenOrientationPortraitPrimary == static_cast<WebScreenOrientation>(WebCore::OrientationPortraitPrimary), WebScreenOrientationPortraitPrimary_Is_Wrong_Should_Be_OrientationPortraitPrimary);
+COMPILE_ASSERT(WebScreenOrientationLandscapePrimary == static_cast<WebScreenOrientation>(WebCore::OrientationLandscapePrimary), WebScreenOrientationLandscapePrimary_Is_Wrong_Should_Be_OrientationLandscapePrimary);
+COMPILE_ASSERT(WebScreenOrientationPortraitSecondary == static_cast<WebScreenOrientation>(WebCore::OrientationPortraitSecondary), WebScreenOrientationPortraitSecondary_Is_Wrong_Should_Be_OrientationPortraitSecondary);
+COMPILE_ASSERT(WebScreenOrientationLandscapeSecondary == static_cast<WebScreenOrientation>(WebCore::OrientationLandscapeSecondary), WebScreenOrientationLandscapeSecondary_Is_Wrong_Should_Be_OrientationLandscapeSecondary);

[Peter Beverloo, 2014/02/13 16:33:42]

This is more verbose than I hoped it'd be.. I recall a thread where someone
argued in favor of having a conversion function
(toScreenOrientationValue(WebScreenOrientation value) with a switch), but I
can't find it.  Perhaps a more experienced reviewer can comment on this.

[Inactive, 2014/02/13 17:03:24]

This is the pattern I found in other files in Blink so at least it is not new. I
remember someone advising against this though on WebKit side, I am not aware of
any similar "rule" in Blink. That said, either way is fine with me.

[Inactive, 2014/02/13 17:06:38]

Oh, I have just found:
Source/web/AssertMatchingEnums.cpp:COMPILE_ASSERT_MATCHING_ENUM()

Sounds like this is the expected way of doing this. I'll update the CL.

[Inactive, 2014/02/13 17:12:31]

Done.

+
+void WebScreenOrientationController::orientationChanged(WebScreenOrientation orientation)
+{
+    m_private->orientationChanged(static_cast<WebCore::ScreenOrientationValue>(orientation));
+}
+
+} // namespace blink