[DevTools] Support device orientation override on device with sensors.

Source/modules/device_orientation/DeviceOrientationController.cpp

Index: Source/modules/device_orientation/DeviceOrientationController.cpp
diff --git a/Source/modules/device_orientation/DeviceOrientationController.cpp b/Source/modules/device_orientation/DeviceOrientationController.cpp
index 038c419c6dc7dccf2990f5bc9ccc518e850990a4..d78e016aa58d9308d3a7478178136142da5404cb 100644
--- a/Source/modules/device_orientation/DeviceOrientationController.cpp
+++ b/Source/modules/device_orientation/DeviceOrientationController.cpp
@@ -49,6 +49,8 @@ DeviceOrientationController::~DeviceOrientationController()
 
 void DeviceOrientationController::didChangeDeviceOrientation(DeviceOrientationData* deviceOrientationData)
 {
+    if (m_overrideOrientationData)
+        return;
     dispatchDeviceEvent(DeviceOrientationEvent::create(EventTypeNames::deviceorientation, deviceOrientationData));
 }
 
@@ -67,15 +69,19 @@ DeviceOrientationController& DeviceOrientationController::from(Document& documen
     return *controller;
 }
 
+DeviceOrientationData* DeviceOrientationController::lastData()
+{
+    return m_overrideOrientationData ? m_overrideOrientationData.get() : DeviceOrientationDispatcher::instance().latestDeviceOrientationData();
+}
+
 bool DeviceOrientationController::hasLastData()
 {
-    return DeviceOrientationDispatcher::instance().latestDeviceOrientationData();
+    return lastData();
 }
 
 PassRefPtr<Event> DeviceOrientationController::getLastEvent()
 {
-    return DeviceOrientationEvent::create(EventTypeNames::deviceorientation,
-        DeviceOrientationDispatcher::instance().latestDeviceOrientationData());
+    return DeviceOrientationEvent::create(EventTypeNames::deviceorientation, lastData());
 }
 
 void DeviceOrientationController::registerWithDispatcher()
@@ -117,4 +123,21 @@ void DeviceOrientationController::didRemoveAllEventListeners(DOMWindow* window)
     m_hasEventListener = false;
 }
 
+void DeviceOrientationController::setOverride(DeviceOrientationData* deviceOrientationData)
+{
+    m_overrideOrientationData.clear();
+    didChangeDeviceOrientation(deviceOrientationData);
+    m_overrideOrientationData = deviceOrientationData;
+}
+
+void DeviceOrientationController::clearOverride()
+{
+    if (!m_overrideOrientationData)
+        return;
+    m_overrideOrientationData.clear();
+    DeviceOrientationData* orientation = lastData();
+    if (orientation)
+        didChangeDeviceOrientation(orientation);
+}
+
 } // namespace WebCore