Do not skip updating composition info on Mac.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 7706d466cf853b7b650d6d1e8a7854f8cfe8fe16..b2babd5ad0dcab700aab008a7bf8d56d7c89daa5 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1842,7 +1842,17 @@ ui::TextInputType RenderWidget::GetTextInputType() {
 }
 
 void RenderWidget::UpdateCompositionInfo(bool immediate_request) {
-  if (!monitor_composition_info_ && !immediate_request)
+#if defined(OS_MACOSX)
+  // On Mac without OOPIF, <webview> IME malfunctions if we skip update.
+  // TODO(crbug.com/714771): Remove this platform-specific guard once we have
+  // a proper fix for crbug.com/714771 or we launch OOPIF for <webview>.
+  const bool may_skip_update =
+      base::FeatureList::IsEnabled(::features::kGuestViewCrossProcessFrames);
+#else
+  const bool may_skip_update = true;
+#endif
+
+  if (may_skip_update && !monitor_composition_info_ && !immediate_request)
     return;  // Do not calculate composition info if not requested.
 
   TRACE_EVENT0("renderer", "RenderWidget::UpdateCompositionInfo");