Make realtimeanalyser-fft-scaling test more robust

LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt

Index: LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt
diff --git a/LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt b/LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt
index 442de878a2643c8fc15337f993e9fd915d843f17..fb72e77f6722b8d25fe4c22917a937a42ac805d8 100644
--- a/LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt
+++ b/LayoutTests/webaudio/realtimeanalyser-fft-scaling-expected.txt
@@ -2,26 +2,26 @@ Test scaling of FFT data for AnalyserNode
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
-PASS Actual FFT peak in the expected position (1)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (1).
+PASS Peak value is near -14.43 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 32
-PASS Actual FFT peak in the expected position (2)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (2).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 64
-PASS Actual FFT peak in the expected position (4)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (4).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 128
-PASS Actual FFT peak in the expected position (8)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (8).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 256
-PASS Actual FFT peak in the expected position (16)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (16).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 512
-PASS Actual FFT peak in the expected position (32)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (32).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 1024
-PASS Actual FFT peak in the expected position (64)
-PASS Peak value is near 0 dBFS as expected
+PASS Actual FFT peak in the expected position (64).
+PASS Peak value is near -13.56 dBFS as expected.
 PASS Analyser correctly scaled FFT data of size 2048
 PASS All Analyser tests passed.
 PASS successfullyParsed is true