Prompt user for file access permission before download starts

content/browser/android/download_controller_android_impl.h

Index: content/browser/android/download_controller_android_impl.h
diff --git a/content/browser/android/download_controller_android_impl.h b/content/browser/android/download_controller_android_impl.h
index fad2320e5d21c816e53d8bb373b44234c1773425..2363d46d34a2c406bb71e812f6cfd3603c03cd57 100644
--- a/content/browser/android/download_controller_android_impl.h
+++ b/content/browser/android/download_controller_android_impl.h
@@ -54,6 +54,11 @@ class DownloadControllerAndroidImpl : public DownloadControllerAndroid,
   // Removes a deferred download from |deferred_downloads_|.
   void CancelDeferredDownload(DeferredDownloadObserver* observer);
 
+  // DownloadControllerAndroid implementation.
+  void AcquireFileAccessPermission(
+      WebContents* web_contents,
+      const AcquireFileAccessPermissionCallback& callback) override;
+
  private:
   // Used to store all the information about an Android download.
   struct DownloadInfoAndroid {
@@ -81,6 +86,10 @@ class DownloadControllerAndroidImpl : public DownloadControllerAndroid,
   DownloadControllerAndroidImpl();
   ~DownloadControllerAndroidImpl() override;
 
+  // Helper method for implementing AcquireFileAccessPermission().
+  bool HasFileAccessPermission(
+      base::android::ScopedJavaLocalRef<jobject> j_content_view_core);
+
   // DownloadControllerAndroid implementation.
   void CreateGETDownload(int render_process_id,
                          int render_view_id,
@@ -116,6 +125,10 @@ class DownloadControllerAndroidImpl : public DownloadControllerAndroid,
   void StartAndroidDownload(int render_process_id,
                             int render_view_id,
                             const DownloadInfoAndroid& info);
+  void StartAndroidDownloadInternal(int render_process_id,
+                                    int render_view_id,
+                                    const DownloadInfoAndroid& info,
+                                    bool allowed);
 
   // The download item contains dangerous file types.
   void OnDangerousDownload(DownloadItem *item);