[WebView] Enable scrolling in fullscreen.

android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java

Index: android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java
diff --git a/android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java b/android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java
index 2a94e604cd5fd822a5289b3c5dd0ca52dd9df079..aea2c09f38af73dc8bf71a476070507fc4aa5efb 100644
--- a/android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java
+++ b/android_webview/java/src/org/chromium/android_webview/NullAwViewMethods.java
@@ -127,4 +127,45 @@ class NullAwViewMethods implements AwViewMethods {
     public void onWindowVisibilityChanged(int visibility) {
         // Intentional no-op.
     }
+
+    @Override
+    public void onContainerViewScrollChanged(int l, int t, int oldl, int oldt) {
+        // Intentional no-op.
+    }
+
+    @Override
+    public void onContainerViewOverScrolled(int scrollX, int scrollY, boolean clampedX,
+            boolean clampedY) {
+        // Intentional no-op.
+    }
+
+    @Override
+    public int computeHorizontalScrollRange() {
+        return 0;
+    }
+
+    @Override
+    public int computeHorizontalScrollOffset() {
+        return 0;
+    }
+
+    @Override
+    public int computeVerticalScrollRange() {
+        return 0;
+    }
+
+    @Override
+    public int computeVerticalScrollOffset() {
+        return 0;
+    }
+
+    @Override
+    public int computeVerticalScrollExtent() {
+        return 0;
+    }
+
+    @Override
+    public void computeScroll() {
+        // Intentional no-op.
+    }
 }