The first step for enabling off-the-spot IME on Pepper on ChromeOS/Linux.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

Index: chrome/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_gtk.cc b/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
index 2970a7fcbf2bccae52e83660af34f98ace941b3c..732a09f78843ff1d208312f01c67573027d23ea1 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -685,6 +685,10 @@ bool RenderWidgetHostViewGtk::HasFocus() {
   return gtk_widget_is_focus(view_.get());
 }
 
+void RenderWidgetHostViewGtk::PpapiPluginFocusChanged(bool focused) {
+  im_context_->OnPpapiPluginFocusChanged(focused);
+}
+
 void RenderWidgetHostViewGtk::Show() {
   gtk_widget_show(view_.get());
 }