First step towards component build for Android.

base/android/jni_string.h

Index: base/android/jni_string.h
diff --git a/base/android/jni_string.h b/base/android/jni_string.h
index 43194a157bf2623c7089346af17b8b034f01cedb..62c4d02c8375e74d6f45e4f004495d13dd2f52d9 100644
--- a/base/android/jni_string.h
+++ b/base/android/jni_string.h
@@ -9,26 +9,27 @@
 #include <string>
 
 #include "base/android/scoped_java_ref.h"
+#include "base/base_export.h"
 #include "base/string_piece.h"
 
 namespace base {
 namespace android {
 
 // Convert a Java string to UTF8. Returns a std string.
-std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str);
-std::string ConvertJavaStringToUTF8(const JavaRef<jstring>& str);
+BASE_EXPORT std::string ConvertJavaStringToUTF8(JNIEnv* env, jstring str);
+BASE_EXPORT std::string ConvertJavaStringToUTF8(const JavaRef<jstring>& str);
 
 // Convert a std string to Java string.
-ScopedJavaLocalRef<jstring> ConvertUTF8ToJavaString(
+BASE_EXPORT ScopedJavaLocalRef<jstring> ConvertUTF8ToJavaString(
     JNIEnv* env,
     const base::StringPiece& str);
 
 // Convert a Java string to UTF16. Returns a string16.
-string16 ConvertJavaStringToUTF16(JNIEnv* env, jstring str);
-string16 ConvertJavaStringToUTF16(const JavaRef<jstring>& str);
+BASE_EXPORT string16 ConvertJavaStringToUTF16(JNIEnv* env, jstring str);
+BASE_EXPORT string16 ConvertJavaStringToUTF16(const JavaRef<jstring>& str);
 
 // Convert a string16 to a Java string.
-ScopedJavaLocalRef<jstring> ConvertUTF16ToJavaString(
+BASE_EXPORT ScopedJavaLocalRef<jstring> ConvertUTF16ToJavaString(
     JNIEnv* env,
     const base::StringPiece16& str);