[Android WebView] Filter out error page URL from onPageFinished to un-flake tests

content/browser/android/web_contents_observer_android.cc

Index: content/browser/android/web_contents_observer_android.cc
diff --git a/content/browser/android/web_contents_observer_android.cc b/content/browser/android/web_contents_observer_android.cc
index 19a622a3829ab564abdefb4e2e8bfe5f70975ccc..108600773fa27e98a019d692759af298b51c64d2 100644
--- a/content/browser/android/web_contents_observer_android.cc
+++ b/content/browser/android/web_contents_observer_android.cc
@@ -16,6 +16,7 @@
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
+#include "content/public/common/url_constants.h"
 #include "jni/WebContentsObserverAndroid_jni.h"
 
 using base::android::AttachCurrentThread;
@@ -215,6 +216,7 @@ void WebContentsObserverAndroid::DidFinishLoad(
     return;
 
   std::string url_string = validated_url.spec();
+  bool is_error_page = content::kUnreachableWebDataURL == url_string;
   NavigationEntry* entry =
     web_contents()->GetController().GetLastCommittedEntry();
   // Note that GetBaseURLForDataURL is only used by the Android WebView.
@@ -223,8 +225,12 @@ void WebContentsObserverAndroid::DidFinishLoad(
 
   ScopedJavaLocalRef<jstring> jstring_url(
       ConvertUTF8ToJavaString(env, url_string));
-  Java_WebContentsObserverAndroid_didFinishLoad(
-      env, obj.obj(), frame_id, jstring_url.obj(), is_main_frame);
+  Java_WebContentsObserverAndroid_didFinishLoad(env,
+                                                obj.obj(),
+                                                frame_id,
+                                                jstring_url.obj(),
+                                                is_main_frame,
+                                                is_error_page);
 }
 
 void WebContentsObserverAndroid::NavigationEntryCommitted(