Add float support for set and get in CameraParameters.

bug:2375989
bug:2375987
diff --git a/include/ui/CameraParameters.h b/include/ui/CameraParameters.h
index b9c2bbe..2c29bfb 100644
--- a/include/ui/CameraParameters.h
+++ b/include/ui/CameraParameters.h
@@ -34,8 +34,10 @@
 
     void set(const char *key, const char *value);
     void set(const char *key, int value);
+    void setFloat(const char *key, float value);
     const char *get(const char *key) const;
     int getInt(const char *key) const;
+    float getFloat(const char *key) const;
 
     /* preview-size=176x144 */
     void setPreviewSize(int width, int height);