Bug 1811076: Part 6 - Show a cancelable "slow agent" dialog on slow c…

…ontent analysis r=nika,Gijs,rkraesig,fluent-reviewers,bolsson

This adds a modal dialog to some content analysis use cases that blocks
input while CA is running.  The dialog can be canceled, which cancels the
CA (if possible) and the operation that required it.

Differential Revision: https://phabricator.services.mozilla.com/D189578

browser/components/contentanalysis/content/ContentAnalysis.sys.mjs

@@ -16,6 +16,13 @@ import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const lazy = {};
 
+XPCOMUtils.defineLazyServiceGetter(
+  lazy,
+  "gContentAnalysis",
+  "@mozilla.org/contentanalysis;1",
+  Ci.nsIContentAnalysis
+);
+
 ChromeUtils.defineESModuleGetters(lazy, {
   clearTimeout: "resource://gre/modules/Timer.sys.mjs",
   setTimeout: "resource://gre/modules/Timer.sys.mjs",
@@ -387,7 +394,10 @@ export const ContentAnalysis = {
   },
 
   _shouldShowBlockingNotification(aOperation) {
-    return false;
+    return !(
+      aOperation == Ci.nsIContentAnalysisRequest.FILE_DOWNLOADED ||
+      aOperation == Ci.nsIContentAnalysisRequest.PRINT
+    );
   },
 
   // This function also transforms the nameOrL10NId so we won't have to
@@ -486,7 +496,8 @@ export const ContentAnalysis = {
         content: this._getResourceNameFromNameOrL10NId(aResourceNameOrL10NId),
       }),
       Ci.nsIPromptService.BUTTON_POS_0 *
-        Ci.nsIPromptService.BUTTON_TITLE_CANCEL,
+        Ci.nsIPromptService.BUTTON_TITLE_CANCEL +
+        Ci.nsIPromptService.SHOW_SPINNER,
       null,
       null,
       null,
@@ -504,6 +515,7 @@ export const ContentAnalysis = {
         // This is also be called if the tab/window is closed while a request is in progress,
         // in which case we need to cancel the request.
         if (this.requestTokenToRequestInfo.delete(aRequestToken)) {
+          lazy.gContentAnalysis.cancelContentAnalysisRequest(aRequestToken);
           let dlpBusyView =
             this.dlpBusyViewsByTopBrowsingContext.getEntry(aBrowsingContext);
           if (dlpBusyView) {

netwerk/base/nsIPrompt.idl

@@ -56,6 +56,8 @@ interface nsIPrompt : nsISupports
     /* used for security dialogs, buttons are initially disabled */
     const unsigned long BUTTON_DELAY_ENABLE        = 1 << 26;
 
+    const unsigned long SHOW_SPINNER               = 1 << 27;
+
     const unsigned long STD_OK_CANCEL_BUTTONS      = (BUTTON_TITLE_OK * BUTTON_POS_0) +
                                                     (BUTTON_TITLE_CANCEL * BUTTON_POS_1);
     const unsigned long STD_YES_NO_BUTTONS         = (BUTTON_TITLE_YES * BUTTON_POS_0) +