android: Crash child immediately on uncaught exception

content/public/android/java/src/org/chromium/content/app/KillChildUncaughtExceptionHandler.java

Index: content/public/android/java/src/org/chromium/content/app/KillChildUncaughtExceptionHandler.java
diff --git a/content/public/android/java/src/org/chromium/content/app/KillChildUncaughtExceptionHandler.java b/content/public/android/java/src/org/chromium/content/app/KillChildUncaughtExceptionHandler.java
new file mode 100644
index 0000000000000000000000000000000000000000..31a762eb7db5efbe19d327b48e8cd33fa79a332c
--- /dev/null
+++ b/content/public/android/java/src/org/chromium/content/app/KillChildUncaughtExceptionHandler.java
@@ -0,0 +1,50 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.content.app;
+
+import android.os.Process;
+
+import org.chromium.base.BuildInfo;
+import org.chromium.base.annotations.MainDex;
+import org.chromium.base.annotations.SuppressFBWarnings;
+
+/**
+ * Handler that immediately kills the current process on an uncaught exception.
+ * This is intended to override Android's default exception handler, which pops up a dialog
+ * and does not finish until user dismisses that dialog.
+ *
+ * Notes:
+ * This does not chain the existing handler.
+ * This does not have any exception handling or crash reporting. Such handlers should be
+ * chained before this handler.
+ */
+@MainDex
+class KillChildUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
+    private boolean mCrashing;
+
+    // Should be called early on start up.
+    static void maybeInstallHandler() {
+        // Only suppress default dialog on release builds. This matches behavior for native crashes
+        // in breakpad::FinalizeCrashDoneAndroid, where the dialog is suppressed on release builds
+        // due to bad user experience. Note this is also the reason the exception stack is not
+        // printed here, to avoid the stack being printed twice in release builds where breakpad
+        // is also enabled.
+        if (BuildInfo.isDebugAndroid()) return;
+        Thread.setDefaultUncaughtExceptionHandler(new KillChildUncaughtExceptionHandler());
+    }
+
+    @Override
+    @SuppressFBWarnings("DM_EXIT")
+    public void uncaughtException(Thread t, Throwable e) {
+        // Never re-enter.
+        if (mCrashing) return;
+        mCrashing = true;
+
+        // Copyed from Android KillApplicationHandler in RuntimeInit.java. This is how the default
+        // Android handler kills this process.
+        Process.killProcess(Process.myPid());
+        System.exit(10);
+    }
+}