Accomodate brightness space change for client target

Previous the hal reported a white point in nits. Since nits are being
removed from the composer interface, SurfaceFlinger converts a dimming
ratio reported by composer into a white point instead.

Bug: 217961164
Test: builds, boots
Change-Id: I9ceec3af80f503df0debe434bb454ec42694811b
Merged-In: I9ceec3af80f503df0debe434bb454ec42694811b
diff --git a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
index 71ae8b4..c2b60cb 100644
--- a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
+++ b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
@@ -318,7 +318,7 @@
             std::vector<IComposerClient::LayerGenericMetadataKey>* outKeys) override;
     Error getClientTargetProperty(Display display,
                                   IComposerClient::ClientTargetProperty* outClientTargetProperty,
-                                  float* outWhitePointNits) override;
+                                  float* outBrightness) override;
 
     // AIDL Composer HAL
     Error setLayerBrightness(Display display, Layer layer, float brightness) override;