RowboatBench crashed when running 2d tests

Nobody has claimed this yet.

```
What steps will reproduce the problem?
1.check on the 2d tests
2.click on the back button on your device
3.the app will crash

What is the expected output? What do you see instead?
Unfortunately, RowboatBench has stopped.

What version of the product are you using? On what operating system?
htc one xl, evita:4.0.3

Please provide any additional information below.
The following Error log will appear:
07-10 18:00:25.788: E/DEBUG(14511): Surface destroyed
07-10 18:00:25.868: W/dalvikvm(14511): threadid=11: thread exiting with
uncaught exception (group=0x40a94a08)
07-10 18:00:25.868: E/AndroidRuntime(14511): FATAL EXCEPTION: Thread-1350
07-10 18:00:25.868: E/AndroidRuntime(14511): java.lang.NullPointerException
07-10 18:00:25.868: E/AndroidRuntime(14511): at
rowboat.benchmark.runner.G2dBenchTwoThread.drawFrame(G2dBenchTwoThread.java:40)
07-10 18:00:25.868: E/AndroidRuntime(14511): at
rowboat.benchmark.runner.G2dBenchBase.drawFrame(G2dBenchBase.java:166)
07-10 18:00:25.868: E/AndroidRuntime(14511): at
rowboat.benchmark.runner.G2dBenchBase.run(G2dBenchBase.java:143)
07-10 18:00:25.868: E/AndroidRuntime(14511): at
java.lang.Thread.run(Thread.java:864)
07-10 18:00:29.572: D/Process(14511): killProcess, pid=14511
07-10 18:00:29.572: D/Process(14511):
dalvik.system.VMStack.getThreadStackTrace(Native Method)
07-10 18:00:29.572: D/Process(14511):
java.lang.Thread.getStackTrace(Thread.java:599)
07-10 18:00:29.572: D/Process(14511):
android.os.Process.killProcess(Process.java:807)
07-10 18:00:29.582: D/Process(14511):
com.android.internal.os.RuntimeInit$UncaughtHandler.uncaughtException(RuntimeIni
t.java:104)
07-10 18:00:29.582: D/Process(14511):
java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:693)
07-10 18:00:29.582: D/Process(14511):
java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
07-10 18:00:29.582: I/Process(14511): Sending signal. PID: 14511 SIG: 9
```

Original issue reported on code.google.com by `maxchen....@gmail.com` on 10 Jul 2012 at 11:33

Attachments:
- [rowboatErrorLog.txt](https://storage.googleapis.com/google-code-attachments/rowboat/issue-164/comment-0/rowboatErrorLog.txt)

Start with rowboat.benchmark.runner.G2dBenchTwoThread.drawFrame at line 40, then inspect the calls from G2dBenchBase.drawFrame and G2dBenchBase.run shown in the stack trace. Reproduce the crash by running the 2d tests and pressing the device back button. Done means the app no longer throws the reported NullPointerException or crashes.

Written by the indexing model from the issue text.