Camera2: Handle preview orientation changes.

- Process sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION)

Bug: 6243944
Change-Id: I92d3bb13312d475703325230487d660a1cb7e0e5
diff --git a/services/camera/libcameraservice/Camera2Client.h b/services/camera/libcameraservice/Camera2Client.h
index 776f981..2dc02bc 100644
--- a/services/camera/libcameraservice/Camera2Client.h
+++ b/services/camera/libcameraservice/Camera2Client.h
@@ -259,6 +259,9 @@
     static status_t validateAreas(const Vector<Parameters::Area> &areas,
                                   size_t maxRegions);
     static bool boolFromString(const char *boolStr);
+
+    // Map from camera orientation + facing to gralloc transform enum
+    static int degToTransform(int degrees, bool mirror);
 };
 
 }; // namespace android