Android: Private-package Tab.setIsShowingErroPage

The method is called by a class in chrome.browser.tab package
in production code. Makes it a private-package method.

Bug: 995903
Change-Id: I5f8b73200ae4a3c966b140a44e63cfc991f9b249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872079Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708466}

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

@@ -467,7 +467,7 @@ public class Tab {
      *
      * @param isShowingErrorPage Whether the tab shows an error page.
      */
-    public void setIsShowingErrorPage(boolean isShowingErrorPage) {
+    void setIsShowingErrorPage(boolean isShowingErrorPage) {
         mIsShowingErrorPage = isShowingErrorPage;
     }
 

chrome/android/javatests/src/org/chromium/chrome/browser/tab/TabTestUtils.java

@@ -111,4 +111,14 @@ public class TabTestUtils {
             Tab tab, WebContents webContents, boolean didStartLoad, boolean didFinishLoad) {
         tab.swapWebContents(webContents, didStartLoad, didFinishLoad);
     }
+
+    /**
+     * Sets whether the tab is showing an error page.  This is reset whenever the tab finishes a
+     * navigation.
+     * @param tab {@link Tab} object.
+     * @param isShowingErrorPage Whether the tab shows an error page.
+     */
+    public void setIsShowingErrorPage(Tab tab, boolean isShowingErrorPage) {
+        tab.setIsShowingErrorPage(isShowingErrorPage);
+    }
 }