Add support for virtual files to Clank.

ui/android/java/src/org/chromium/ui/base/WindowAndroid.java

Index: ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
diff --git a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
index fc60dd20831b3b554d11e1b868ea753fab43c084..e21330b72290bf71b1532f1de61f0b0db0ff956b 100644
--- a/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
+++ b/ui/android/java/src/org/chromium/ui/base/WindowAndroid.java
@@ -10,7 +10,6 @@ import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.PendingIntent;
-import android.content.ContentResolver;
 import android.content.Context;
 import android.content.ContextWrapper;
 import android.content.Intent;
@@ -495,11 +494,10 @@ public class WindowAndroid {
          * Handles the data returned by the requested intent.
          * @param window A window reference.
          * @param resultCode Result code of the requested intent.
-         * @param contentResolver An instance of ContentResolver class for accessing returned data.
+         * @param context Application context.

[agrieve, 2016/12/07 16:44:54]

No need to ever pass around the application context. It's available as
ContextUtils.getApplicationContext().

[mtomasz, 2016/12/08 06:36:37]

Done.

          * @param data The data returned by the intent.
          */
-        void onIntentCompleted(WindowAndroid window, int resultCode,
-                ContentResolver contentResolver, Intent data);
+        void onIntentCompleted(WindowAndroid window, int resultCode, Context context, Intent data);
     }
 
     /**