Added the comment for GetApplicationContext()

base/android/jni_android.h

 // Copyright (c) 2011 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>
 
 namespace base {
 namespace android {
 
 // Attach the current thread to the VM (if necessary) and return the JNIEnv*.
 JNIEnv* AttachCurrentThread();
 
 // Detach the current thread from VM if it is attached.
 void DetachFromVM();
 
 // Initializes the global JVM. It is not necessarily called before
 // InitApplicationContext().
 void InitVM(JavaVM* vm);
 
 // Initializes the global application context object. The |context| should be
 // the global reference of application context object.  It is not necessarily
 // called after InitVM().
 // TODO: We might combine InitVM() and InitApplicationContext() into one method.
 void InitApplicationContext(jobject context);
 
+// Returns the application context assigned by InitApplicationContext().
 jobject GetApplicationContext();
 
 // Get the method ID for a method. Will clear the pending Java
 // exception and return 0 if the method is not found.
 jmethodID GetMethodID(JNIEnv* env,
                       jclass clazz,
                       const char* const method,
                       const char* const jni_signature);
 
 // Returns true if an exception is pending in the provided JNIEnv*.
 // If an exception is pending, it is printed.
 bool CheckException(JNIEnv* env);
 
 }  // namespace android
 }  // namespace base
-#endif
+
+#endif  // BASE_ANDROID_JNI_ANDROID_H_