diff --git a/patch/patch.cfg b/patch/patch.cfg
index a05e12911..a5c0e7221 100644
--- a/patch/patch.cfg
+++ b/patch/patch.cfg
@@ -256,4 +256,10 @@ patches = [
     'name': 'storage_partition_1973',
     'path': '../',
   },
+  {
+    # Fix debug assertion on right-click context menu.
+    # https://codereview.chromium.org/2288083002
+    'name': 'webkit_eventhandler_2288083002',
+    'path': '../',
+  },
 ]
diff --git a/patch/patches/webkit_eventhandler_2288083002.patch b/patch/patches/webkit_eventhandler_2288083002.patch
new file mode 100644
index 000000000..020972a6f
--- /dev/null
+++ b/patch/patches/webkit_eventhandler_2288083002.patch
@@ -0,0 +1,15 @@
+diff --git third_party/WebKit/Source/core/input/EventHandler.cpp third_party/WebKit/Source/core/input/EventHandler.cpp
+index 9c49350..aa5e6a9 100644
+--- third_party/WebKit/Source/core/input/EventHandler.cpp
++++ third_party/WebKit/Source/core/input/EventHandler.cpp
+@@ -2039,6 +2039,10 @@ WebInputEventResult EventHandler::sendContextMenuEvent(const PlatformMouseEvent&
+     LayoutPoint positionInContents = v->rootFrameToContents(event.position());
+     HitTestRequest request(HitTestRequest::Active);
+     MouseEventWithHitTestResults mev = m_frame->document()->prepareMouseEvent(request, positionInContents, event);
++    // Since |Document::prepareMouseEvent()| modifies layout tree for setting
++    // hover element, we need to update layout tree for requirement of
++    // |SelectionController::sendContextMenuEvent()|.
++    m_frame->document()->updateStyleAndLayoutIgnorePendingStylesheets();
+ 
+     selectionController().sendContextMenuEvent(mev, positionInContents);
+