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

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "chrome/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 642 matching lines @@
 
 void RenderWidgetHostViewMac::KillSelf() {
   if (shutdown_factory_.empty()) {
     [cocoa_view_ setHidden:YES];
     MessageLoop::current()->PostTask(FROM_HERE,
         shutdown_factory_.NewRunnableMethod(
             &RenderWidgetHostViewMac::ShutdownHost));
   }
 }
 
+void RenderWidgetHostViewMac::PpapiPluginFocusChanged(bool focused) {

[kochi, 2011/05/25 06:19:44]

TODO(kinaba): Implement this.
is fine for now.

If there is no need to do anything on Mac, please write  a comment about the
reason here.

BTW, do you have an environment to test Mac?

[kinaba, 2011/05/25 22:23:53]

Removed from the patch set 2.
I have, but it is a slow laptop, and I don't have for Win at all.

+}
+
 void RenderWidgetHostViewMac::PluginFocusChanged(bool focused, int plugin_id) {
   [cocoa_view_ pluginFocusChanged:(focused ? YES : NO) forPlugin:plugin_id];
 }
 
 void RenderWidgetHostViewMac::StartPluginIme() {
   [cocoa_view_ setPluginImeActive:YES];
 }
 
 bool RenderWidgetHostViewMac::PostProcessEventForPluginIme(
     const NativeWebKeyboardEvent& event) {
@@ skipping 1896 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end