ImageWriterTest: Dump first input image

Useful for debugging failing tests.

Test: file shows up, contains data (when debug logging is enabled)
Bug: 170981222
Change-Id: I7ce52250340a049d86fc14883272726549947246
diff --git a/tests/camera/src/android/hardware/camera2/cts/ImageWriterTest.java b/tests/camera/src/android/hardware/camera2/cts/ImageWriterTest.java
index 06ab2b8..6398e01 100644
--- a/tests/camera/src/android/hardware/camera2/cts/ImageWriterTest.java
+++ b/tests/camera/src/android/hardware/camera2/cts/ImageWriterTest.java
@@ -305,6 +305,11 @@
                     "ImageWriter 1st input image should match camera 1st output image",
                     isImageStronglyEqual(inputImage, cameraImage));
 
+            if (DEBUG) {
+                String inputFileName = mDebugFileNameBase + "/" + maxSize + "_image1_input.yuv";
+                dumpFile(inputFileName, getDataFromImage(inputImage));
+            }
+
             // Image should be closed after queueInputImage call
             Plane closedPlane = inputImage.getPlanes()[0];
             ByteBuffer closedBuffer = closedPlane.getBuffer();