IME crashes when using US International hardware keyboard

[GoogleCodeExporter]

Version: 1.15.1785-3-arm

Steps to reproduce:
1. Attach USB hardware keyboard to phone
2. Set keyboard layout to US, International style
3. Select a text input field, Japanese IME opens
4. Press the ` key  (on US International style, this is used also for entering 
diacritics)

Expected result:
The character ` is displayed

Actual result:
Crash with below stack trace


09-13 14:16:24.802  2559  2559 E AndroidRuntime: FATAL EXCEPTION: main
09-13 14:16:24.802  2559  2559 E AndroidRuntime: Process: 
com.google.android.inputmethod.japanese, PID: 2559
09-13 14:16:24.802  2559  2559 E AndroidRuntime: 
java.lang.IllegalArgumentException: Invalid code point: -2147482933
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
java.lang.Character.checkValidCodePoint(Character.java:1551)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
java.lang.Character.access$100(Character.java:100)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
java.lang.Character$UnicodeBlock.of(Character.java:1512)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
com.google.android.inputmethod.japanese.c.e.f(SourceFile:410)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
com.google.android.inputmethod.japanese.MozcService.onKeyDown(SourceFile:820)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.view.KeyEvent.dispatch(KeyEvent.java:2640)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.inputmethodservice.AbstractInputMethodService$AbstractInputMethodSession
Impl.dispatchKeyEvent(AbstractInputMethodService.java:136)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.inputmethodservice.IInputMethodSessionWrapper$ImeInputEventReceiver.onIn
putEvent(IInputMethodSessionWrapper.java:213)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.os.MessageQueue.nativePollOnce(Native Method)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.os.MessageQueue.next(MessageQueue.java:138)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.os.Looper.loop(Looper.java:123)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
android.app.ActivityThread.main(ActivityThread.java:5001)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
java.lang.reflect.Method.invokeNative(Native Method)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
java.lang.reflect.Method.invoke(Method.java:515)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
09-13 14:16:24.802  2559  2559 E AndroidRuntime:    at 
dalvik.system.NativeStart.main(Native Method)
09-13 14:16:26.392   775  7834 I WindowState: WIN DEATH: Window{4380a2e0 u0 
InputMethod}

Hardware: Nexus 5 'hammerhead'

Build: KTU84P
Build fingerprint: 
'google/hammerhead/hammerhead:4.4.4/KTU84P/1227136:user/release-keys'
Bootloader: HHZ11k
Radio: msm
Network: NTT DOCOMO
Kernel: Linux version 3.4.0-gd59db4e (android-build@vpbs1.mtv.corp.google.com) 
(gcc version 4.7 (GCC) ) #1 SMP PREEMPT Mon Mar 17 15:16:36 PDT 2014

Original issue reported on code.google.com by c...@daydream.org.uk on 13 Sep 2014 at 5:51