Add DIR_ANDROID_EXTERNAL_STORAGE to base/base_path.h

base/android/java/src/org/chromium/base/PathUtils.java

Index: base/android/java/src/org/chromium/base/PathUtils.java
diff --git a/base/android/java/src/org/chromium/base/PathUtils.java b/base/android/java/src/org/chromium/base/PathUtils.java
index e63bf62d46d233709054a0dfc317a2aac62fba26..c3503a4b6135e7b1ab8202a497d35e9dca4a3d96 100644
--- a/base/android/java/src/org/chromium/base/PathUtils.java
+++ b/base/android/java/src/org/chromium/base/PathUtils.java
@@ -73,4 +73,13 @@ public abstract class PathUtils {
 
         return "/system/lib/";
     }
+
+    /**
+     * @return the external storage directory.
+     */
+    @SuppressWarnings("unused")
+    @CalledByNative
+    public static String getExternalStorageDirectory() {
+        return Environment.getExternalStorageDirectory().getAbsolutePath();
+    }
 }