Add DIR_ANDROID_EXTERNAL_STORAGE to base/base_path.h

base/base_paths_android.cc

Index: base/base_paths_android.cc
diff --git a/base/base_paths_android.cc b/base/base_paths_android.cc
index 51923d5412dac82ef5b5a9a376493bf8dbcdf105..449b731713cbd157ad39c58da14330de5fa143a7 100644
--- a/base/base_paths_android.cc
+++ b/base/base_paths_android.cc
@@ -60,6 +60,10 @@ bool PathProviderAndroid(int key, FilePath* result) {
       *result = file_util::GetHomeDir();
       return true;
     }
+    case base::DIR_ANDROID_EXTERNAL_STORAGE: {
+      *result = FilePath(base::android::GetExternalStorageDirectory());
+      return true;
+    }
     default: {
       // Note: the path system expects this function to override the default
       // behavior. So no need to log an error if we don't support a given