IDevice: Add a qmlProfilerHost function

This seems to be a better abstraction than the "pseudo dynamic cast"
in the QmlProfilerTool and the DebuggerPlugin itself.

Change-Id: If7dea70e1353852ebb6d3ce43220c0b03ccb4b00
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

src/plugins/android/androiddevice.h

@@ -50,6 +50,7 @@ public:
     ProjectExplorer::DeviceProcessSignalOperation::Ptr signalOperation() const;
 
     ProjectExplorer::IDevice::Ptr clone() const;
+    QString qmlProfilerHost() const;
 
 protected:
     friend class AndroidDeviceFactory;