Wallpaper: Propagate transform hint from WM to BBQ surface

This allows the buffer producer to consume the transform hint
for the first frame.

Bug: 194425759
Test: Rotate static wallpaper and check transform sent to HWC for wallpaper layer
Change-Id: I7f688c35ea836f57e3443e03d584fa85e745c6f9

core/java/android/service/wallpaper/WallpaperService.java

@@ -1033,6 +1033,9 @@ public abstract class WallpaperService extends Service {
                                     .build();
                             updateSurfaceDimming();
                         }
+                        // Propagate transform hint from WM so we can use the right hint for the
+                        // first frame.
+                        mBbqSurfaceControl.setTransformHint(mSurfaceControl.getTransformHint());
                         Surface blastSurface = getOrCreateBLASTSurface(mSurfaceSize.x,
                                 mSurfaceSize.y, mFormat);
                         // If blastSurface == null that means it hasn't changed since the last