Add history popup when long pressing on the back key.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 7a4c05e963061f7c0e5e18756dbdf72d558d39f8..6d31fe74c17b0af24ee026f4e4115ed6e98798fd 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -890,6 +890,14 @@ public class ContentViewCore implements MotionEventDelegate {
     }
 
     /**
+     * Navigates to the specified index in the navigation entry for this page.
+     * @param index The navigation index to navigate to.
+     */
+    public void goToNavigationIndex(int index) {
+        if (mNativeContentViewCore != 0) nativeGoToNavigationIndex(mNativeContentViewCore, index);
+    }
+
+    /**
      * Goes to the navigation entry before the current one.
      */
     public void goBack() {
@@ -2354,9 +2362,10 @@ public class ContentViewCore implements MotionEventDelegate {
      * Callback factory method for nativeGetNavigationHistory().
      */
     @CalledByNative
-    private void addToNavigationHistory(Object history, String url, String virtualUrl,
+    private void addToNavigationHistory(Object history, int index, String url, String virtualUrl,
             String originalUrl, String title, Bitmap favicon) {
-        NavigationEntry entry = new NavigationEntry(url, virtualUrl, originalUrl, title, favicon);
+        NavigationEntry entry = new NavigationEntry(
+                index, url, virtualUrl, originalUrl, title, favicon);
         ((NavigationHistory) history).addEntry(entry);
     }
 
@@ -2371,6 +2380,18 @@ public class ContentViewCore implements MotionEventDelegate {
     }
 
     /**
+     * Get a directed copy of the navigation history of the view.
+     * @param isForward Whether the returned history should be entries after the current entry.
+     * @param itemLimit The limit on the number of items included in the history.
+     * @return A directed navigation for the page.
+     */
+    public NavigationHistory getDirectedNavigationHistory(boolean isForward, int itemLimit) {
+        NavigationHistory history = new NavigationHistory();
+        nativeGetDirectedNavigationHistory(mNativeContentViewCore, history, isForward, itemLimit);
+        return history;
+    }
+
+    /**
      * Update of the latest vsync parameters.
      * @param tickTimeMicros The latest vsync tick time in microseconds.
      * @param intervalMicros The vsync interval in microseconds.
@@ -2467,16 +2488,12 @@ public class ContentViewCore implements MotionEventDelegate {
             int nativeContentViewCoreImpl, int x1, int y1, int x2, int y2);
 
     private native boolean nativeCanGoBack(int nativeContentViewCoreImpl);
-
     private native boolean nativeCanGoForward(int nativeContentViewCoreImpl);
-
     private native boolean nativeCanGoToOffset(int nativeContentViewCoreImpl, int offset);
-
-    private native void nativeGoToOffset(int nativeContentViewCoreImpl, int offset);
-
     private native void nativeGoBack(int nativeContentViewCoreImpl);
-
     private native void nativeGoForward(int nativeContentViewCoreImpl);
+    private native void nativeGoToOffset(int nativeContentViewCoreImpl, int offset);
+    private native void nativeGoToNavigationIndex(int nativeContentViewCoreImpl, int index);
 
     private native void nativeStopLoading(int nativeContentViewCoreImpl);
 
@@ -2519,6 +2536,8 @@ public class ContentViewCore implements MotionEventDelegate {
     private native void nativeRemoveJavascriptInterface(int nativeContentViewCoreImpl, String name);
 
     private native int nativeGetNavigationHistory(int nativeContentViewCoreImpl, Object context);
+    private native void nativeGetDirectedNavigationHistory(int nativeContentViewCoreImpl,
+            Object context, boolean isForward, int maxEntries);
 
     private native void nativeUpdateVSyncParameters(int nativeContentViewCoreImpl,
             long timebaseMicros, long intervalMicros);