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..c7b8fd0d12771bd73828459267f39592aabc4bf9 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
@@ -889,6 +889,10 @@ public class ContentViewCore implements MotionEventDelegate {
         if (mNativeContentViewCore != 0) nativeGoToOffset(mNativeContentViewCore, offset);
     }
 
+    public void goToNavigationIndex(int index) {

[David Trainor- moved to gerrit, 2013/01/03 18:57:31]

javadoc!?  What happens if index is out of bounds?

[Ted C, 2013/01/03 19:56:41]

It's behavior for out of bounds is determined by the implementation of the
navigation controller, so it seems odd to me to specify that here (or any of the
other methods for that matter as we don't actually check the input ourselves).

[David Trainor- moved to gerrit, 2013/01/04 18:11:11]

Fair enough!
On 2013/01/03 19:56:41, Ted C wrote:

+        if (mNativeContentViewCore != 0) nativeGoToNavigationIndex(mNativeContentViewCore, index);
+    }
+
     /**
      * Goes to the navigation entry before the current one.
      */
@@ -2354,9 +2358,10 @@ 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 +2376,18 @@ 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 +2484,12 @@ 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 +2532,8 @@ 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);