Implement the Blink part of the Device Motion API.

Source/Platform/chromium/public/WebDeviceMotionData.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
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+ * modification, are permitted provided that the following conditions are
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+ */
+
+#ifndef WebDeviceMotionData_h
+#define WebDeviceMotionData_h
+
+#include "../../../Platform/chromium/public/WebCommon.h"
+
+#if WEBKIT_IMPLEMENTATION
+namespace WTF { template <typename T> class PassRefPtr; }
+namespace WebCore { class DeviceMotionData; }
+#endif
+
+namespace WebKit {
+
+#pragma pack(push, 1)
+
+class WebDeviceMotionData {
+public:
+    WebDeviceMotionData();

[darin (slow to review), 2013/05/16 19:41:15]

this constructor needs to be exported so Chromium side can call it.

[timvolodine, 2013/05/17 13:36:38]

Done.

+    ~WebDeviceMotionData() { }
+
+#if WEBKIT_IMPLEMENTATION
+    WEBKIT_EXPORT operator WTF::PassRefPtr<WebCore::DeviceMotionData>() const;

[darin (slow to review), 2013/05/16 19:41:15]

this method does not need to be exported since it is limited by
WEBKIT_IMPLEMENTATION.  only Blink can call it and the code lives inside Blink
so no need to export it.

see third_party/WebKit/Source/WebKit/chromium/README for more details about the
WEBKIT_EXPORT macro.

nit: since WebDeviceMotionData is part of the Platform/ layer, instead of adding
this casting operator, you can just make DeviceMotionData have a create() method
that takes a WebKit::WebDeviceMotionData.  things in core/ and modules/ can
depend on interfaces defined in Platform/chromium/public/! :-D  Doing so would
be a lot cleaner and simpler.

[timvolodine, 2013/05/17 13:36:38]

moved this whole thing to WebCore::DeviceMotionData. Done.

+#endif
+
+    double accelerationX;
+    double accelerationY;
+    double accelerationZ;
+
+    double accelerationIncludingGravityX;
+    double accelerationIncludingGravityY;
+    double accelerationIncludingGravityZ;
+
+    double rotationRateAlpha;
+    double rotationRateBeta;
+    double rotationRateGamma;
+
+    double interval;
+
+    bool hasAccelerationX : 1;
+    bool hasAccelerationY : 1;
+    bool hasAccelerationZ : 1;
+
+    bool hasAccelerationIncludingGravityX : 1;
+    bool hasAccelerationIncludingGravityY : 1;
+    bool hasAccelerationIncludingGravityZ : 1;
+
+    bool hasRotationRateAlpha : 1;
+    bool hasRotationRateBeta : 1;
+    bool hasRotationRateGamma : 1;
+};
+
+#if WEBKIT_IMPLEMENTATION
+COMPILE_ASSERT(sizeof(WebDeviceMotionData) == (10 * sizeof(double) + 2 * sizeof(char)), WebDeviceMotionData_has_wrong_size);
+#endif
+
+#pragma pack(pop)
+
+} // namespace WebKit
+
+#endif // WebDeviceMotionData_h