Camera: allow more time for AF

In low light condition, exposure time may slow down capture
frame rate so AF might take more time to finish.

Bug: 18122317
Change-Id: I54285bf26b0c120b0b421e47b75e99b67ad5a6ec
diff --git a/tests/tests/hardware/src/android/hardware/camera2/cts/StillCaptureTest.java b/tests/tests/hardware/src/android/hardware/camera2/cts/StillCaptureTest.java
index c3cf8d0..25f6928 100644
--- a/tests/tests/hardware/src/android/hardware/camera2/cts/StillCaptureTest.java
+++ b/tests/tests/hardware/src/android/hardware/camera2/cts/StillCaptureTest.java
@@ -116,7 +116,7 @@
     private static final int MAX_REGIONS_AE_INDEX = 0;
     private static final int MAX_REGIONS_AWB_INDEX = 1;
     private static final int MAX_REGIONS_AF_INDEX = 2;
-    private static final int WAIT_FOR_FOCUS_DONE_TIMEOUT_MS = 3000;
+    private static final int WAIT_FOR_FOCUS_DONE_TIMEOUT_MS = 6000;
     private static final double AE_COMPENSATION_ERROR_TOLERANCE = 0.2;
     private static final int NUM_FRAMES_WAITED = 30;
     // 5 percent error margin for resulting metering regions