Add display Power Mode information while layer dumps

Specify active display information while HWC layer dumps, depending on
the display Power Mode status.

Bug: 199037164
Test: dumpsys SurfaceFlinger
Change-Id: I09d6cb4462a6701ba8d3a841e6b5adf188c18b64
Signed-off-by: Siddharth Kapoor <ksiddharth@google.com>
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 594fde3..217f3bb 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -5149,7 +5149,8 @@
             continue;
         }
 
-        StringAppendF(&result, "Display %s HWC layers:\n", to_string(*displayId).c_str());
+        StringAppendF(&result, "Display %s (%s) HWC layers:\n", to_string(*displayId).c_str(),
+                      (isDisplayActiveLocked(display) ? "active" : "inactive"));
         Layer::miniDumpHeader(result);
 
         const DisplayDevice& ref = *display;