[WebSocket] Add comment about the flag values.

Added why the value is not a power of 2.

Change-Id: I987c50197d8535b2020e9576bdefe3c3ba71c1e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792509
Commit-Queue: Yoichi Osato <[email protected]>
Commit-Queue: Adam Rice <[email protected]>
Auto-Submit: Yoichi Osato <[email protected]>
Reviewed-by: Adam Rice <[email protected]>
Cr-Commit-Position: refs/heads/master@{#695036}
diff --git a/net/websockets/websocket_basic_stream.cc b/net/websockets/websocket_basic_stream.cc
index 0dc01150..8140b0c5 100644
--- a/net/websockets/websocket_basic_stream.cc
+++ b/net/websockets/websocket_basic_stream.cc
@@ -74,6 +74,7 @@
 #if defined(OS_ANDROID)
 const int kReadBufferSize = 32 * 1024;
 #else
+// |2^n - delta| is better than 2^n on Linux. See crrev.com/c/1792208.
 const int kReadBufferSize = 131000;
 #endif