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

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/chrome/browser/renderer_host/render_widget_host_view_mac.mm b/chrome/browser/renderer_host/render_widget_host_view_mac.mm
index bf4ce950865f2af8515c63ac99c92a43520098c6..580a3c016bccaaebe180d955370440e6776e8536 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/chrome/browser/renderer_host/render_widget_host_view_mac.mm
@@ -660,6 +660,9 @@ void RenderWidgetHostViewMac::KillSelf() {
   }
 }
 
+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];
 }