Add EventForwarder for routing touch events

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

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 3d676f0a74e3a7539570d6625d8dbe892e73d6c6..6e8a3882924dd5444173219f6b023111548c8f9b 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -94,6 +94,7 @@ import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewClient;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.crypto.CipherFactory;
+import org.chromium.content_public.browser.EventForwarder;
 import org.chromium.content_public.browser.GestureStateListener;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContents;
@@ -1088,6 +1089,15 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
     }
 
     /**
+     * @return The {@link EventForwarder} used to forward input/view events down to native, or
+     *         {@code null} if the tab is displaying native page for which the native content
+     *         is not present.
+     */
+    public EventForwarder getEventForwarder() {
+        return mNativePage == null ? getWebContents().getEventForwarder() : null;
+    }
+
+    /**
      * @return The {@link NativePage} associated with the current page, or {@code null} if there is
      *         no current page or the current page is displayed using something besides
      *         {@link NativePage}.