10% improvement by changing FastNative to CriticalNative

This patch change native APIs from @FastNative to @CriticalNative.
From the benchmark, it gets 10% improvement.

The CriticalNative requires the native function can't access JNIEnv
and any jobject. nativeGetAttributeIndex can't apply CriticalNative
because it needs JNIEnv to transform Java String.

This patches move the 16 APIs from FastNative to CriticalNative.
* 11 APIs check the null document and throw NPE in native layer. They
  are change to return ERROR_NULL_DOCUMENT and throw NPE in java
  layer.
* 5 APIs just remove JNIEnv and jobject parameters.
  * nativeGetNamespace
  * nativeGetName
  * nativeGetText
  * nativeGetStyleAttribute
  * nativeGetSourceResId

Reference: ag/19992907
Bug: 173709508

Test: # for FastNative
     atest --iterations 20 \
       CorePerfTests:android.content.res.XmlBlockBenchmark \
       2>&1 > fn20.txt
Test: # for CriticalNative
     atest --iterations 20 \
       CorePerfTests:android.content.res.XmlBlockBenchmark \
       2>&1 > cn20.txt
Test: http://b/issues/173709508#comment2

Change-Id: I43ccd1177fa86df5cd4d432119cbd06d370e82d8