Android: adds Get(Static)MethodIDOrNULL.

base/android/jni_android.h

 // Copyright (c) 2012 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.
 
 #ifndef BASE_ANDROID_JNI_ANDROID_H_
 #define BASE_ANDROID_JNI_ANDROID_H_
 
 #include <jni.h>
 #include <sys/types.h>
 
@@ skipping 53 matching lines @@
                       const JavaRef<jclass>& clazz,
                       const char* method_name,
                       const char* jni_signature);
 
 // Similar to GetMethodID, but takes a raw jclass.
 jmethodID GetMethodID(JNIEnv* env,
                       jclass clazz,
                       const char* method_name,
                       const char* jni_signature);
 
+// Unlike GetMethodID, returns NULL if the method could not be found.
+jmethodID GetMethodIDOrNULL(JNIEnv* env,

[Sami, 2012/10/01 11:32:15]

Nit: GetMethodIDOrNull would be more consistent with existing naming. Or:
TryGetMethodID -- either way :)

[bulach, 2012/10/01 15:08:37]

Done.

+                            jclass clazz,
+                            const char* method_name,
+                            const char* jni_signature);
+
 // Returns the method ID for the static method with the specified name and
 // signature.
 // This method triggers a fatal assertion if the method could not be found.
 // Use HasMethod if you need to check whether a method exists.
 jmethodID GetStaticMethodID(JNIEnv* env,
                             const JavaRef<jclass>& clazz,
                             const char* method_name,
                             const char* jni_signature);
 
 // Similar to the GetStaticMethodID, but takes a raw jclass.
 jmethodID GetStaticMethodID(JNIEnv* env,
                             jclass clazz,
                             const char* method_name,
                             const char* jni_signature);
 
+// Unlike GetStaticMethodID, returns NULL if the method could not be found.
+jmethodID GetStaticMethodIDOrNULL(JNIEnv* env,
+                                  jclass clazz,
+                                  const char* method_name,
+                                  const char* jni_signature);
+
 
 // Returns true iff |clazz| has a method with the specified name and signature.
 bool HasMethod(JNIEnv* env,
                const JavaRef<jclass>& clazz,
                const char* method_name,
                const char* jni_signature);
 
 // Gets the method ID from the class name. Clears the pending Java exception
 // and returns NULL if the method is not found. Caches results. Note that
 // GetMethodID() below avoids a class lookup, but does not cache results.
@@ skipping 34 matching lines @@
 // and returns true.
 bool ClearException(JNIEnv* env);
 
 // This function will call CHECK() macro if there's any pending exception.
 void CheckException(JNIEnv* env);
 
 }  // namespace android
 }  // namespace base
 
 #endif  // BASE_ANDROID_JNI_ANDROID_H_