Dynamically enable spatial navigation based on events

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 26c026d485a22739b1fd045160985ea2ace9b5f5..59b0998caed3462ad33ed2e0b355dafdb6503ca1 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -1226,6 +1226,9 @@ public class AwContents {
      * @see android.webkit.WebView#dispatchKeyEvent(KeyEvent)
      */
     public boolean dispatchKeyEvent(KeyEvent event) {
+        if (AwWebContentsDelegateAdapter.getViewDirectionFromKeyEvent(event) != 0) {
+            mSettings.setSpatialNavigationEnabled(true);
+        }
         return mContentViewCore.dispatchKeyEvent(event);
     }
 
@@ -1484,6 +1487,10 @@ public class AwContents {
     public boolean onTouchEvent(MotionEvent event) {
         if (mNativeAwContents == 0) return false;
 
+        if (event.getActionMasked() == MotionEvent.ACTION_DOWN) {
+            mSettings.setSpatialNavigationEnabled(false);
+        }
+
         mScrollOffsetManager.setProcessingTouchEvent(true);
         boolean rv = mContentViewCore.onTouchEvent(event);
         mScrollOffsetManager.setProcessingTouchEvent(false);