PDF Viewer: Only show bookmarks focus outline on keyboard interaction.

Fixed: 1131119
Change-Id: I9ce8308f5c5832c7156cc60ff55a6b5c561161d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424650
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809558}

chrome/browser/resources/pdf/BUILD.gn

@@ -172,6 +172,7 @@ js_library("pdf_viewer") {
     "//ui/webui/resources/js:load_time_data.m",
     "//ui/webui/resources/js:promise_resolver.m",
     "//ui/webui/resources/js:util.m",
+    "//ui/webui/resources/js/cr/ui:focus_outline_manager.m",
   ]
   externs_list = [ "$externs_path/resources_private.js" ]
 }

chrome/browser/resources/pdf/elements/viewer-bookmark.html

@@ -26,11 +26,16 @@
       }
 
       #title {
+        outline: none;
         overflow: hidden;
         text-overflow: ellipsis;
         white-space: nowrap;
       }
 
+      :host-context(.focus-outline-visible) #title:focus {
+        outline: auto -webkit-focus-ring-color;
+      }
+
       :host-context([pdf-viewer-update-enabled]) #title {
         white-space: initial;
       }

chrome/browser/resources/pdf/pdf_viewer.js

@@ -16,6 +16,7 @@ import 'chrome://resources/cr_elements/hidden_style_css.m.js';
 import 'chrome://resources/cr_elements/shared_vars_css.m.js';
 
 import {assert, assertNotReached} from 'chrome://resources/js/assert.m.js';
+import {FocusOutlineManager} from 'chrome://resources/js/cr/ui/focus_outline_manager.m.js';
 import {loadTimeData} from 'chrome://resources/js/load_time_data.m.js';
 import {hasKeyModifiers, listenOnce} from 'chrome://resources/js/util.m.js';
 import {html} from 'chrome://resources/polymer/v3_0/polymer/polymer_bundled.min.js';
@@ -277,6 +278,8 @@ export class PDFViewerElement extends PDFViewerBaseElement {
               LOCAL_STORAGE_SIDENAV_COLLAPSED_KEY),
           10));
     }
+
+    FocusOutlineManager.forDocument(document);
   }
 
   /** @override */