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
+
+#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();
+    ~WebDeviceMotionData() { }
+
+    void setAccelerationX(double);

[darin (slow to review), 2013/05/14 18:13:37]

these methods need to be exported using the WEBKIT_EXPORT macro

[timvolodine, 2013/05/15 12:34:34]

The presubmit check complains on this:
WEBKIT_EXPORT should not be used on a function with a body.

+    void setAccelerationY(double);
+    void setAccelerationZ(double);
+
+    void setAccelerationIncludingGravityX(double);
+    void setAccelerationIncludingGravityY(double);
+    void setAccelerationIncludingGravityZ(double);
+
+    void setRotationRateAlpha(double);
+    void setRotationRateBeta(double);
+    void setRotationRateGamma(double);
+
+    void setInterval(double);
+
+    double accelerationX() const { return m_accelerationX; }
+    double accelerationY() const { return m_accelerationY; }
+    double accelerationZ() const { return m_accelerationZ; }
+
+    double accelerationIncludingGravityX() const { return m_accelerationIncludingGravityX; }
+    double accelerationIncludingGravityY() const { return m_accelerationIncludingGravityY; }
+    double accelerationIncludingGravityZ() const { return m_accelerationIncludingGravityZ; }
+
+    double rotationRateAlpha() const { return m_rotationRateAlpha; }
+    double rotationRateBeta() const { return m_rotationRateBeta; }
+    double rotationRateGamma() const { return m_rotationRateGamma; }
+
+    double interval() const { return m_interval; }
+
+    double hasAccelerationX() const { return m_hasAccelerationX; }
+    double hasAccelerationY() const { return m_hasAccelerationY; }
+    double hasAccelerationZ() const { return m_hasAccelerationZ; }
+
+    double hasAccelerationIncludingGravityX() const { return m_hasAccelerationIncludingGravityX; }
+    double hasAccelerationIncludingGravityY() const { return m_hasAccelerationIncludingGravityY; }
+    double hasAccelerationIncludingGravityZ() const { return m_hasAccelerationIncludingGravityZ; }
+
+    double hasRotationRateAlpha() const { return m_hasRotationRateAlpha; }
+    double hasRotationRateBeta() const { return m_hasRotationRateBeta; }
+    double hasRotationRateGamma() const { return m_hasRotationRateGamma; }
+
+#if WEBKIT_IMPLEMENTATION
+    operator WTF::PassRefPtr<WebCore::DeviceMotionData>() const;
+#endif
+
+private:
+    double m_accelerationX;

[darin (slow to review), 2013/05/14 18:13:37]

why isn't WebDeviceMotionData just a simple ref-counted wrapper around
WebCore::DeviceMotionData?  You can use
WebPrivatePtr<WebCore::DeviceMotionData>, no?  See for example WebNode.

[timvolodine, 2013/05/15 12:34:34]

hmm, looks like a nice construction indeed, however WebDeviceMotionData is also
used in the shared memory buffer and WebCore::DeviceMotionData is not very
suited for this purpose because it has Ref pointers to its members and it seems
the only way to set new data is to create a new object..

+    double m_accelerationY;
+    double m_accelerationZ;
+
+    double m_accelerationIncludingGravityX;
+    double m_accelerationIncludingGravityY;
+    double m_accelerationIncludingGravityZ;
+
+    double m_rotationRateAlpha;
+    double m_rotationRateBeta;
+    double m_rotationRateGamma;
+
+    double m_interval;
+
+    bool m_hasAccelerationX : 1;
+    bool m_hasAccelerationY : 1;
+    bool m_hasAccelerationZ : 1;
+
+    bool m_hasAccelerationIncludingGravityX : 1;
+    bool m_hasAccelerationIncludingGravityY : 1;
+    bool m_hasAccelerationIncludingGravityZ : 1;
+
+    bool m_hasRotationRateAlpha : 1;
+    bool m_hasRotationRateBeta : 1;
+    bool m_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