[MediaRouter] Add warning for invalid permissions

This patch adds a new check to the media router views UI that, on Mac OS
X 10.15+ (Catalina), checks if the screen capture permission has been
granted, and shows a warning message and fails to cast if so.

Bug: 1087236
Change-Id: I3afdfdb06a011fee3e6fd5f199d375d0ab6eef88
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298479
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789194}

chrome/app/media_router_strings.grdp

@@ -76,8 +76,13 @@
   <message name="IDS_MEDIA_ROUTER_ISSUE_TAB_AUDIO_NOT_SUPPORTED" desc="Title of an issue shown when the user is casting a tab, but only its visual content can be cast and not its audio output.">
     Casting tab audio is not supported on this device.
   </message>
+  <if expr="is_macosx">
+    <message name="IDS_MEDIA_ROUTER_ISSUE_MAC_SCREEN_CAPTURE_PERMISSION_ERROR" desc="Title of an issue shown when the user is casting a window or desktop, and the associated MAC OS X 10.15+ system permission for 'Screen Recording' is not granted.">
+      Unable to cast screen. Check the Screen Recording permission in System Preferences.
+    </message>
+  </if>
 
-  <!-- Sink List -->
+<!-- Sink List -->
   <message name="IDS_MEDIA_ROUTER_STATUS_LOOKING_FOR_DEVICES" desc="Status text temporarily shown while searching for Cast devices but none have been found.">
     Looking for devices
   </message>

chrome/app/media_router_strings_grdp/IDS_MEDIA_ROUTER_ISSUE_MAC_SCREEN_CAPTURE_PERMISSION_ERROR.png.sha1

+132219c7007d8910e5c140403116c879cbae30bc
\ No newline at end of file

chrome/browser/ui/views/media_router/media_router_views_ui.cc

@@ -54,6 +54,11 @@
 #include "ui/display/display.h"
 #include "url/origin.h"
 
+#if defined(OS_MACOSX)
+#include "base/mac/mac_util.h"
+#include "ui/base/cocoa/permissions_utils.h"
+#endif
+
 namespace media_router {
 
 namespace {
@@ -368,6 +373,15 @@ bool MediaRouterViewsUI::CreateRoute(const MediaSink::Id& sink_id,
     return false;
   }
 
+#if defined(OS_MACOSX)
+  if (base::mac::IsAtLeastOS10_15() &&
+      cast_mode == MediaCastMode::DESKTOP_MIRROR &&
+      !ui::IsScreenCaptureAllowed()) {
+    SendIssueForScreenPermission(sink_id);
+    return false;
+  }
+#endif
+
   GetIssueManager()->ClearNonBlockingIssues();
 
   auto on_document_available = base::BindOnce(
@@ -745,6 +759,18 @@ void MediaRouterViewsUI::SendIssueForRouteTimeout(
   AddIssue(issue_info);
 }
 
+#if defined(OS_MACOSX)
+void MediaRouterViewsUI::SendIssueForScreenPermission(
+    const MediaSink::Id& sink_id) {
+  std::string issue_title = l10n_util::GetStringUTF8(
+      IDS_MEDIA_ROUTER_ISSUE_MAC_SCREEN_CAPTURE_PERMISSION_ERROR);
+  IssueInfo issue_info(issue_title, IssueInfo::Action::DISMISS,
+                       IssueInfo::Severity::WARNING);
+  issue_info.sink_id = sink_id;
+  AddIssue(issue_info);
+}
+#endif
+
 void MediaRouterViewsUI::SendIssueForUnableToCast(
     MediaCastMode cast_mode,
     const MediaSink::Id& sink_id) {

chrome/browser/ui/views/media_router/media_router_views_ui.h

@@ -233,8 +233,14 @@ class MediaRouterViewsUI
       const MediaSink::Id& sink_id,
       const base::string16& presentation_request_source_name);
 
+// Creates and sends an issue if casting fails due to lack of screen
+// permissions.
+#if defined(OS_MACOSX)
+  void SendIssueForScreenPermission(const MediaSink::Id& sink_id);
+#endif
+
   // Creates and sends an issue if casting fails for any reason other than
-  // timeout.
+  // those above.
   void SendIssueForUnableToCast(MediaCastMode cast_mode,
                                 const MediaSink::Id& sink_id);