Test for BrowserPlugin-based WebView Focus

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index e3a036176bbdbf690e3546a543b0b2c005d3fd63..909c5e15f8223316c9603951ff1e071cd04f34d3 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -45,6 +45,7 @@ RenderWidgetHostViewChildFrame::RenderWidgetHostViewChildFrame(
       last_output_surface_id_(0),
       current_surface_scale_factor_(1.f),
       ack_pending_count_(0),
+      surface_frame_count_(0),
       frame_connector_(nullptr),
       begin_frame_source_(nullptr),
       observing_begin_frame_source_(false),
@@ -352,6 +353,9 @@ void RenderWidgetHostViewChildFrame::SurfaceDrawn(uint32_t output_surface_id,
                                                   cc::SurfaceDrawStatus drawn) {
   cc::CompositorFrameAck ack;
   DCHECK_GT(ack_pending_count_, 0U);
+
+  surface_frame_count_++;
+
   if (!surface_returned_resources_.empty())
     ack.resources.swap(surface_returned_resources_);
   if (host_) {
@@ -684,6 +688,7 @@ void RenderWidgetHostViewChildFrame::ClearCompositorSurfaceIfNecessary() {
   if (surface_factory_ && !surface_id_.is_null())
     surface_factory_->Destroy(surface_id_);
   surface_id_ = cc::SurfaceId();
+  surface_frame_count_ = 0;
 }
 
 bool RenderWidgetHostViewChildFrame::IsChildFrameForTesting() const {