Show the original host in Android Omnibox during pending HTTPS Previews

The Virtual URL handling won't work while the navigation is pending.
So, for every time the URL is updated on Android, check if the visible
URL is a HTTPS Server Preview URL and if so, return the original host.

Bug: 894881
Change-Id: I143c70bdb1b2985ed0c475b603cb25cf93d7468a
Reviewed-on: https://chromium-review.googlesource.com/c/1280859Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599722}

chrome/browser/previews/android/previews_android_bridge.cc

@@ -7,6 +7,7 @@
 #include <memory>
 
 #include "base/android/jni_android.h"
+#include "chrome/browser/previews/previews_lite_page_navigation_throttle.h"
 #include "chrome/browser/previews/previews_ui_tab_helper.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/PreviewsAndroidBridge_jni.h"
@@ -51,11 +52,17 @@ PreviewsAndroidBridge::GetOriginalHost(
   if (!web_contents)
     return base::android::ScopedJavaLocalRef<jstring>();
 
-  // TODO(crbug.com/894881): Add the Lite Pages URL rewriting during a pending
-  // navigation.
+  GURL visible_url = web_contents->GetVisibleURL();
+
+  std::string original_url;
+  if (PreviewsLitePageNavigationThrottle::GetOriginalURL(visible_url,
+                                                         &original_url)) {
+    return base::android::ScopedJavaLocalRef<jstring>(
+        base::android::ConvertUTF8ToJavaString(env, GURL(original_url).host()));
+  }
+
   return base::android::ScopedJavaLocalRef<jstring>(
-      base::android::ConvertUTF8ToJavaString(
-          env, web_contents->GetVisibleURL().host()));
+      base::android::ConvertUTF8ToJavaString(env, visible_url.host()));
 }
 
 base::android::ScopedJavaLocalRef<jstring>