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

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index ae2d0d7902bbfecac808ac935043f0086d918783..4ef291924897777fcd2472d74e91031b4433a479 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -787,6 +787,18 @@ void RenderWidgetCompositor::Layout() {
 }
 
 void RenderWidgetCompositor::ApplyViewportDeltas(
+    const gfx::Vector2d& inner_delta,
+    const gfx::Vector2d& outer_delta,
+    float page_scale,
+    float top_controls_delta) {
+  widget_->webwidget()->applyViewportDeltas(
+      inner_delta,
+      outer_delta,
+      page_scale,
+      top_controls_delta);
+}
+
+void RenderWidgetCompositor::ApplyViewportDeltas(
     const gfx::Vector2d& scroll_delta,
     float page_scale,
     float top_controls_delta) {