Listen to ElementSizeChanged event

atom/renderer/guest_view_container.cc

@@ -4,12 +4,54 @@
 
 #include "atom/renderer/guest_view_container.h"
 
+#include <map>
+
+#include "base/lazy_instance.h"
+
 namespace atom {
 
-GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame) {
+namespace {
+
+using GuestViewContainerMap = std::map<int, GuestViewContainer*>;
+static base::LazyInstance<GuestViewContainerMap> g_guest_view_container_map =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame)
+    : render_frame_(render_frame) {
 }
 
 GuestViewContainer::~GuestViewContainer() {
+  if (element_instance_id_ > 0)
+    g_guest_view_container_map.Get().erase(element_instance_id_);
+}
+
+// static
+GuestViewContainer* GuestViewContainer::FromID(int element_instance_id) {
+  GuestViewContainerMap* guest_view_containers =
+      g_guest_view_container_map.Pointer();
+  auto it = guest_view_containers->find(element_instance_id);
+  return it == guest_view_containers->end() ? nullptr : it->second;
+}
+
+void GuestViewContainer::RegisterElementResizeCallback(
+    const ResizeCallback& callback) {
+  element_resize_callback_ = callback;
+}
+
+void GuestViewContainer::SetElementInstanceID(int element_instance_id) {
+  element_instance_id_ = element_instance_id;
+  g_guest_view_container_map.Get().insert(
+      std::make_pair(element_instance_id, this));
+}
+
+void GuestViewContainer::DidResizeElement(const gfx::Size& old_size,
+                                          const gfx::Size& new_size) {
+  if (element_resize_callback_.is_null())
+    return;
+
+  element_resize_callback_.Run(old_size, new_size);
 }
 
 }  // namespace atom