Made double-tap zoom work in pinch virtual viewport mode (Chromium-side).

content/test/web_layer_tree_view_impl_for_testing.cc

Index: content/test/web_layer_tree_view_impl_for_testing.cc
diff --git a/content/test/web_layer_tree_view_impl_for_testing.cc b/content/test/web_layer_tree_view_impl_for_testing.cc
index ffe67d780eaebeb1f7e3bcd2080d80e16fad614d..21917b900d67e7a28f106f390dee5cbf016ebac2 100644
--- a/content/test/web_layer_tree_view_impl_for_testing.cc
+++ b/content/test/web_layer_tree_view_impl_for_testing.cc
@@ -138,6 +138,12 @@ void WebLayerTreeViewImplForTesting::Layout() {
 }
 
 void WebLayerTreeViewImplForTesting::ApplyViewportDeltas(
+    const gfx::Vector2d& inner_delta,
+    const gfx::Vector2d& outer_delta,
+    float page_scale,
+    float top_controls_delta) {}
+
+void WebLayerTreeViewImplForTesting::ApplyViewportDeltas(
     const gfx::Vector2d& scroll_delta,
     float page_scale,
     float top_controls_delta) {}