Make it possible for the scroll offset delegate to intercept fling.

android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java

Index: android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java
diff --git a/android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java b/android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java
index 38604840708be140205ea7ba8bc6acb662259a86..b83690ef2a98ac50268ec042e263e68d48a5ca28 100644
--- a/android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java
+++ b/android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java
@@ -119,6 +119,11 @@ public class AwTestContainerView extends FrameLayout {
     }
 
     @Override
+    public void computeScroll() {
+        mAwContents.computeScroll();
+    }
+
+    @Override
     public void onVisibilityChanged(View changedView, int visibility) {
         super.onVisibilityChanged(changedView, visibility);
         mAwContents.onVisibilityChanged(changedView, visibility);