[RESTRICT AUTOMERGE]: Properly synchronize CrashReporter.java

The oc-dev change missed a line

Bug: 162378163
Test: run StagefrightTests and don't see an IllegalStateMonitor
Change-Id: I44c2d7b777a300be52818574e03f122361a4c6dc
diff --git a/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/targetprep/CrashReporter.java b/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/targetprep/CrashReporter.java
index 58133bb..98f3561 100644
--- a/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/targetprep/CrashReporter.java
+++ b/common/host-side/tradefed/src/com/android/compatibility/common/tradefed/targetprep/CrashReporter.java
@@ -165,7 +165,7 @@
         }
 
         @Override
-        public void processNewLines(String[] lines) {
+        public synchronized void processNewLines(String[] lines) {
             this.notifyAll(); // alert the main thread that we are active.
             if (!isCancelled()) {
                 for (String line : lines) {