[Icons NTP] Add chrome://large-icon host, which resizes icon and renders fallback.

chrome/common/url_constants.cc

Index: chrome/common/url_constants.cc
diff --git a/chrome/common/url_constants.cc b/chrome/common/url_constants.cc
index 4a4397ec84669ddfcb33d3e6e121d17fb8a04961..53d5e4a31b028f78e4285857f0ba5fe388acd29a 100644
--- a/chrome/common/url_constants.cc
+++ b/chrome/common/url_constants.cc
@@ -59,6 +59,7 @@ const char kChromeUIInspectURL[] = "chrome://inspect/";
 const char kChromeUIInstantURL[] = "chrome://instant/";
 const char kChromeUIInterstitialURL[] = "chrome://interstitials/";
 const char kChromeUIInvalidationsURL[] = "chrome://invalidations/";
+const char kChromeUILargeIconURL[] = "chrome://large-icon/";
 const char kChromeUIMdSettingsURL[] = "chrome://md-settings/";
 const char kChromeUIMemoryRedirectURL[] = "chrome://memory-redirect/";
 const char kChromeUIMemoryURL[] = "chrome://memory/";
@@ -204,6 +205,7 @@ const char kChromeUIInstantHost[] = "instant";
 const char kChromeUIInterstitialHost[] = "interstitials";
 const char kChromeUIInvalidationsHost[] = "invalidations";
 const char kChromeUIKillHost[] = "kill";
+const char kChromeUILargeIconHost[] = "large-icon";
 const char kChromeUILocalStateHost[] = "local-state";
 const char kChromeUIMdSettingsHost[] = "md-settings";
 const char kChromeUIMemoryHost[] = "memory";