Fix OSK flickering issue

content/renderer/ime_event_guard.cc

Index: content/renderer/ime_event_guard.cc
diff --git a/content/renderer/ime_event_guard.cc b/content/renderer/ime_event_guard.cc
index 9e4789d13382cd4e39330599cc82dd8b49aedac3..aaed1712a7be85267fe7f7c1fe6e20445593ea3c 100644
--- a/content/renderer/ime_event_guard.cc
+++ b/content/renderer/ime_event_guard.cc
@@ -8,12 +8,19 @@
 
 namespace content {
 
-ImeEventGuard::ImeEventGuard(RenderWidget* widget) : widget_(widget) {
-  widget_->StartHandlingImeEvent();
+ImeEventGuard::ImeEventGuard(RenderWidget* widget)
+  : ImeEventGuard(widget, false, true) {
+}
+
+ImeEventGuard::ImeEventGuard(RenderWidget* widget, bool show_ime, bool from_ime)
+  : widget_(widget),
+    show_ime_(show_ime),
+    from_ime_(from_ime) {
+  widget_->OnImeEventGuardStart(this);
 }
 
 ImeEventGuard::~ImeEventGuard() {
-  widget_->FinishHandlingImeEvent();
+  widget_->OnImeEventGuardFinish(this);
 }
 
 } //  namespace content