App Banner: require 'display' to be set to 'standalone' or 'fullscreen'.

chrome/browser/banners/app_banner_debug_log.cc

Index: chrome/browser/banners/app_banner_debug_log.cc
diff --git a/chrome/browser/banners/app_banner_debug_log.cc b/chrome/browser/banners/app_banner_debug_log.cc
index bff2cdf87d53a0f936ccfd553030077557456dca..dac19e0351a7961a054f98eb967872259871de1e 100644
--- a/chrome/browser/banners/app_banner_debug_log.cc
+++ b/chrome/browser/banners/app_banner_debug_log.cc
@@ -30,6 +30,8 @@ static const char kUserNavigatedBeforeBannerShownMessage[] =
     "the user navigated before the banner could be shown";
 static const char kStartURLNotValidMessage[] =
     "start URL in manifest is not valid";
+static const char kManifestDisplayStandaloneFullscreenMessage[] =
+    "manifest display property must be set to 'standalone' or 'fullscreen'";
 static const char kManifestMissingNameOrShortNameMessage[] =
     "one of manifest name or short name must be specified";
 static const char kManifestMissingSuitableIconMessage[] =
@@ -94,6 +96,9 @@ void OutputDeveloperNotShownMessage(content::WebContents* web_contents,
     case kStartURLNotValid:
       pattern = kStartURLNotValidMessage;
       break;
+    case kManifestDisplayStandaloneFullscreen:
+      pattern = kManifestDisplayStandaloneFullscreenMessage;
+      break;
     case kManifestMissingNameOrShortName:
       pattern = kManifestMissingNameOrShortNameMessage;
       break;