Increase tolerance factor in audio decoder tests.

This is required for the test to pass on Android P.

Bug: 931480
Change-Id: I65dc175ed754a4201204bfdaf1cacd70d5f7e0df
Reviewed-on: https://chromium-review.googlesource.com/c/1471462Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632353}

media/filters/audio_decoder_unittest.cc

@@ -363,7 +363,7 @@ class AudioDecoderTest
     // Generate a lossy hash of the audio used for comparison across platforms.
     AudioHash audio_hash;
     audio_hash.Update(output.get(), output->frames());
-    EXPECT_TRUE(audio_hash.IsEquivalent(sample_info.hash, 0.02))
+    EXPECT_TRUE(audio_hash.IsEquivalent(sample_info.hash, 0.03))
         << "Audio hashes differ. Expected: " << sample_info.hash
         << " Actual: " << audio_hash.ToString();