Corrected the limit on the allowed API jitter in AEC3

This CL loosens the requirement on the API jitter in APM
that can be tolerated without affecting the AEC3 performance.

BUG=webrtc:7911,chromium:738323

Review-Url: https://codereview.webrtc.org/2967493004
Cr-Commit-Position: refs/heads/master@{#18849}
diff --git a/webrtc/modules/audio_processing/aec3/aec3_common.h b/webrtc/modules/audio_processing/aec3/aec3_common.h
index 3ea26c2..04b86e9 100644
--- a/webrtc/modules/audio_processing/aec3/aec3_common.h
+++ b/webrtc/modules/audio_processing/aec3/aec3_common.h
@@ -63,7 +63,7 @@
 constexpr size_t kRenderDelayBufferSize =
     (3 * kDownsampledRenderBufferSize) / (4 * kSubBlockSize);
 
-constexpr size_t kMaxApiCallsJitterBlocks = 20;
+constexpr size_t kMaxApiCallsJitterBlocks = 30;
 constexpr size_t kRenderTransferQueueSize = kMaxApiCallsJitterBlocks / 2;
 static_assert(2 * kRenderTransferQueueSize >= kMaxApiCallsJitterBlocks,
               "Requirement to ensure buffer overflow detection");