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..da9a582f318b61c7caaba4662e9f6fadb23c6f7e 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, IME malfunctions if we skip update.

[aelias_OOO_until_Jul13, 2017/05/23 18:14:48]

"On Mac without OOPIF, <webview> IME"

+  // TODO(crbug.com/714771): Remove this platform-specific guard once we have
+  // a proper fix for crbug.com/714771 or we fully launch OOPIF.

[aelias_OOO_until_Jul13, 2017/05/23 18:14:48]

doesn't need "fully launch OOPIF", just "launch OOPIF for <webview>.

+  const bool may_skip_update =
+      base::FeatureList::IsEnabled(::features::kGuestViewCrossProcessFrames);

[aelias_OOO_until_Jul13, 2017/05/23 18:19:25]

Please check that the current renderer is a <webview> tag.  As it is, this
change also affects non-webview on Mac since the feature flag is global, so it
doesn't really address my concern.

ekaramad@, what is the way to check that we're within a webview?

[EhsanK, 2017/05/23 18:39:50]

Yes this is the generic way.

+#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");