Implementation of shared worker code path for WebView file system permission.

chrome/browser/guest_view/web_view/web_view_guest.h

Index: chrome/browser/guest_view/web_view/web_view_guest.h
diff --git a/chrome/browser/guest_view/web_view/web_view_guest.h b/chrome/browser/guest_view/web_view/web_view_guest.h
index b79f9ef6f6be740e403cf473a2050f515ca66d80..7ccd823fe48eac2d678912fb40eb314d58c63005 100644
--- a/chrome/browser/guest_view/web_view/web_view_guest.h
+++ b/chrome/browser/guest_view/web_view/web_view_guest.h
@@ -245,8 +245,9 @@ class WebViewGuest : public GuestView<WebViewGuest>,
   }
 
   // Called when file system access is requested by the guest content using the
-  // asynchronous HTML5 file system API. The request is plumbed through the
-  // <webview> permission request API. The request will be:
+  // HTML5 file system API in main thread, or a worker thread.
+  // The request is plumbed through the <webview> permission request API. The
+  // request will be:
   // - Allowed if the embedder explicitly allowed it.
   // - Denied if the embedder explicitly denied.
   // - Determined by the guest's content settings if the embedder does not
@@ -254,15 +255,15 @@ class WebViewGuest : public GuestView<WebViewGuest>,
   // If access was blocked due to the page's content settings,
   // |blocked_by_policy| should be true, and this function should invoke
   // OnContentBlocked.
-  static void FileSystemAccessedAsync(int render_process_id,
-                                      int render_frame_id,
-                                      int request_id,
-                                      const GURL& url,
-                                      bool blocked_by_policy);
+  static void FileSystemAccessed(int render_process_id,
+                                 int render_frame_id,
+                                 const GURL& url,
+                                 bool blocked_by_policy,
+                                 base::Callback<void(bool)> callback);
 
   // Called when file system access is requested by the guest content using the
-  // synchronous HTML5 file system API in a worker thread or shared worker. The
-  // request is plumbed through the <webview> permission request API. The
+  // HTML5 file system API from shared workers.
+  // The request is plumbed through the <webview> permission request API. The
   // request will be:
   // - Allowed if the embedder explicitly allowed it.
   // - Denied if the embedder explicitly denied.
@@ -271,11 +272,14 @@ class WebViewGuest : public GuestView<WebViewGuest>,
   // If access was blocked due to the page's content settings,
   // |blocked_by_policy| should be true, and this function should invoke
   // OnContentBlocked.
-  static void FileSystemAccessedSync(int render_process_id,
-                                     int render_frame_id,
-                                     const GURL& url,
-                                     bool blocked_by_policy,
-                                     IPC::Message* reply_msg);
+  // Different from FileSystemAccessed, this function will only request
+  // permission, but won't call TabSpecificContentSettings::FileSystemAccessed.
+  static void RequestFileSystemAccessPermission(
+      int render_process_id,
+      int render_frame_id,
+      const GURL& url,
+      bool blocked_by_policy,
+      base::Callback<void(bool)> callback);
 
  private:
   virtual ~WebViewGuest();
@@ -331,17 +335,12 @@ class WebViewGuest : public GuestView<WebViewGuest>,
                                   bool allow,
                                   const std::string& user_input);
 
-  static void FileSystemAccessedAsyncResponse(int render_process_id,
-                                              int render_frame_id,
-                                              int request_id,
-                                              const GURL& url,
-                                              bool allowed);
-
-  static void FileSystemAccessedSyncResponse(int render_process_id,
-                                             int render_frame_id,
-                                             const GURL& url,
-                                             IPC::Message* reply_msg,
-                                             bool allowed);
+  static void FileSystemAccessedResponse(
+      int render_process_id,
+      int render_frame_id,
+      const GURL& url,
+      base::Callback<void(bool)> callback,
+      bool allowed);
 
   // WebContentsObserver implementation.
   virtual void DidCommitProvisionalLoadForFrame(