Fix wrong cast in ExtensionsGuestViewContainer.

components/guest_view/renderer/guest_view_container.cc

Index: components/guest_view/renderer/guest_view_container.cc
diff --git a/components/guest_view/renderer/guest_view_container.cc b/components/guest_view/renderer/guest_view_container.cc
index 0ec3d5fe8c0a7f506fdad6d0c778f52460528d7c..4d5c34193f55b535ac8684f1d4d51b868bb30386 100644
--- a/components/guest_view/renderer/guest_view_container.cc
+++ b/components/guest_view/renderer/guest_view_container.cc
@@ -5,12 +5,14 @@
 #include "components/guest_view/renderer/guest_view_container.h"
 
 #include "base/macros.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "components/guest_view/common/guest_view_constants.h"
 #include "components/guest_view/common/guest_view_messages.h"
 #include "components/guest_view/renderer/guest_view_request.h"
 #include "content/public/renderer/render_frame.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "content/public/renderer/render_view.h"
+#include "ui/gfx/geometry/size.h"
 
 namespace {
 
@@ -53,6 +55,7 @@ GuestViewContainer::GuestViewContainer(content::RenderFrame* render_frame)
       render_frame_(render_frame),
       in_destruction_(false),
       destruction_isolate_(nullptr),
+      element_resize_isolate_(nullptr),
       weak_ptr_factory_(this) {
   render_frame_lifetime_observer_.reset(
       new RenderFrameLifetimeObserver(this, render_frame_));
@@ -223,6 +226,45 @@ void GuestViewContainer::DidDestroyElement() {
   Destroy(false);
 }
 
+void GuestViewContainer::RegisterElementResizeCallback(
+    v8::Local<v8::Function> callback,
+    v8::Isolate* isolate) {
+  element_resize_callback_.Reset(isolate, callback);
+  element_resize_isolate_ = isolate;
+}
+
+void GuestViewContainer::DidResizeElement(const gfx::Size& new_size) {
+  // Call the element resize callback, if one is registered.
+  if (element_resize_callback_.IsEmpty())
+    return;
+
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE,
+      base::Bind(&GuestViewContainer::CallElementResizeCallback,
+                 weak_ptr_factory_.GetWeakPtr(), new_size));
+}
+
+void GuestViewContainer::CallElementResizeCallback(
+    const gfx::Size& new_size) {
+  v8::HandleScope handle_scope(element_resize_isolate_);
+  v8::Local<v8::Function> callback = v8::Local<v8::Function>::New(
+      element_resize_isolate_, element_resize_callback_);
+  v8::Local<v8::Context> context = callback->CreationContext();
+  if (context.IsEmpty())
+    return;
+
+  const int argc = 2;
+  v8::Local<v8::Value> argv[argc] = {
+      v8::Integer::New(element_resize_isolate_, new_size.width()),
+      v8::Integer::New(element_resize_isolate_, new_size.height())};
+
+  v8::Context::Scope context_scope(context);
+  v8::MicrotasksScope microtasks(
+      element_resize_isolate_, v8::MicrotasksScope::kDoNotRunMicrotasks);
+
+  callback->Call(context->Global(), argc, argv);
+}
+
 base::WeakPtr<content::BrowserPluginDelegate> GuestViewContainer::GetWeakPtr() {
   return weak_ptr_factory_.GetWeakPtr();
 }