webapps: initial addition of splash screen icon downloading

chrome/browser/banners/app_banner_debug_log.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/banners/app_banner_debug_log.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace banners {
 
 const char kRendererRequestCancel[] =
     "renderer has requested the banner prompt be cancelled";
 const char kManifestEmpty[] = "manifest is empty or missing";
 const char kCannotDetermineBestIcon[] =
     "could not determine the best icon to use";
+const char kCannotDetermineBestSplashIcon[] =
+    "could not determine the best splashscreen icon to use";
 const char kNoMatchingServiceWorker[] =
     "no matching service worker detected. You may need to reload the page, or "
     "check that the service worker for the current page also controls the "
     "start URL from the manifest";
 const char kNoIconAvailable[] = "no icon available to display";
+const char kNoSplashIconAvailable[] =
+    "no splashscreen icon available to display";
 const char kBannerAlreadyAdded[] =
     "site requesting the banner has already been added";
 const char kUserNavigatedBeforeBannerShown[] =
     "the user navigated before the banner could be shown";
 const char kStartURLNotValid[] = "start URL in manifest is not valid";
 const char kManifestMissingNameOrShortName[] =
     "one of manifest name or short name must be specified";
 const char kManifestMissingSuitableIcon[] =
     "manifest does not contain a suitable icon - PNG format of at least "
     "144x144px is required";
@@ skipping 17 matching lines @@
   std::string log_message = "App banner " + message;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kBypassAppBannerEngagementChecks) && web_contents) {
     web_contents->GetMainFrame()->Send(
         new ChromeViewMsg_AppBannerDebugMessageRequest(
             web_contents->GetMainFrame()->GetRoutingID(), log_message));
   }
 }
 
 }  // namespace banners