[Android] Fix new tab not to show 'about:blank' at the beginning

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

Index: chrome/android/java/src/org/chromium/chrome/browser/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
index 5091dccfc0f094072c2e25a5e3868816c8e5ef91..4ceafc18f3302f89acc6dafbcb3bc4c4ed12efe6 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/Tab.java
@@ -49,6 +49,7 @@ import org.chromium.content.browser.ContentViewClient;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.WebContentsObserver;
 import org.chromium.content_public.browser.LoadUrlParams;
+import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.common.Referrer;
 import org.chromium.content_public.common.TopControlsState;
@@ -578,6 +579,13 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
                 observer.onDidDetachInterstitialPage(Tab.this);
             }
         }
+
+        @Override
+        public void didStartNavigationToPendingEntry(String url, int reloadType) {
+            for (TabObserver observer : mObservers) {
+                observer.onDidStartNavigationToPendingEntry(Tab.this, url, reloadType);
+            }
+        }
     }
 
     /**
@@ -2268,6 +2276,19 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
         if (view != null) view.requestFocus();
     }
 
+    /**
+     * Check whether the current navigation entry is initial, meaning whether it has
+     * the same target URL as the initial URL of the tab.
+     * @return Whether the current navigation entry is initial.
+     */
+    public boolean isCurrentNavigationEntryInitial() {

[Ted C, 2015/01/29 21:42:08]

I wouldn't add this here.  It's just is a helper function and Tab exposes all
the bits it needs to for the callers to do this on their own (and there are not
enough callers to necessitate this helper IMHO).

[Changwan Ryu, 2015/01/30 00:03:24]

Done.

+        WebContents webContents = getWebContents();
+        if (webContents == null) return false;
+        NavigationController navigationController = webContents.getNavigationController();
+        if (navigationController == null) return false;
+        return navigationController.isInitialNavigation();
+    }
+
     @CalledByNative
     protected void openNewTab(String url, String extraHeaders, byte[] postData, int disposition,
             boolean hasParent, boolean isRendererInitiated) {