Cronet: fix flaky Http2Test#testHttp2

components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java

Index: components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
diff --git a/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java b/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
index f3c95b6904e95ed7839c52f7ef4b640f79c1b8a5..c20db8d21615404c146b892bbb3b11c618410d4f 100644
--- a/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
+++ b/components/cronet/android/java/src/org/chromium/net/impl/CronetUrlRequestContext.java
@@ -140,7 +140,7 @@ public class CronetUrlRequestContext extends CronetEngineBase {
     /** Holds CertVerifier data. */
     private String mCertVerifierData;
 
-    private ConditionVariable mStopNetLogCompleted;
+    private volatile ConditionVariable mStopNetLogCompleted;
 
     /**
      * True if a NetLog observer is active.
@@ -297,9 +297,9 @@ public class CronetUrlRequestContext extends CronetEngineBase {
                 return;
             }
             checkHaveAdapter();
+            mStopNetLogCompleted = new ConditionVariable();
             nativeStopNetLog(mUrlRequestContextAdapter);
             mIsLogging = false;
-            mStopNetLogCompleted = new ConditionVariable();
         }
         mStopNetLogCompleted.block();
     }