Prompt user for file access permission before download starts

content/public/browser/android/download_controller_android.h

Index: content/public/browser/android/download_controller_android.h
diff --git a/content/public/browser/android/download_controller_android.h b/content/public/browser/android/download_controller_android.h
index fd035d734ec1c5bffd3b2580c8501c5f8c60b361..859a8a0a4e7d8decc7c92050308b351c81fe0a94 100644
--- a/content/public/browser/android/download_controller_android.h
+++ b/content/public/browser/android/download_controller_android.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_PUBLIC_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_DOWNLOAD_CONTROLLER_ANDROID_H_
 
+#include "base/callback.h"
 #include "content/common/content_export.h"
 #include "content/public/common/context_menu_params.h"
 
@@ -19,6 +20,10 @@ class CONTENT_EXPORT DownloadControllerAndroid {
   // Returns the singleton instance of the DownloadControllerAndroid.
   static DownloadControllerAndroid* Get();
 
+  // Called to set the DownloadControllerAndroid instance.
+  static void SetDownloadControllerAndroid(
+      DownloadControllerAndroid* download_controller);
+
   // Starts a new download request with Android. Should be called on the
   // UI thread.
   virtual void CreateGETDownload(int render_process_id, int render_view_id,
@@ -38,8 +43,22 @@ class CONTENT_EXPORT DownloadControllerAndroid {
   virtual void DangerousDownloadValidated(
       WebContents* web_contents, int download_id, bool accept) = 0;
 
+  // Callback when user permission prompt finishes. Args: whether file access
+  // permission is acquired.
+  typedef base::Callback<void(bool)> AcquireFileAccessPermissionCallback;
+
+  // Called to prompt the user for file access permission. When finished,
+  // |callback| will be executed.
+  virtual void AcquireFileAccessPermission(
+      WebContents* web_contents,
+      const AcquireFileAccessPermissionCallback& callback) = 0;
+
+  // Called by unit test to approve or disapprove file access request.
+  virtual void SetApproveFileAccessRequestForTesting(bool approve) {};
+
  protected:
   virtual ~DownloadControllerAndroid() {};
+  static DownloadControllerAndroid* download_controller_;
 };
 
 }  // namespace content