Correctly sets the security origin for the IME window.

chrome/browser/ui/views/ime/ime_window_browsertest.cc

Index: chrome/browser/ui/views/ime/ime_window_browsertest.cc
diff --git a/chrome/browser/ui/views/ime/ime_window_browsertest.cc b/chrome/browser/ui/views/ime/ime_window_browsertest.cc
index 2b8bbf77ba13276fbc2648b6933a98990ff5d9c0..e77e00eb143160c6ab2c8ce0cde22d7964dd5c70 100644
--- a/chrome/browser/ui/views/ime/ime_window_browsertest.cc
+++ b/chrome/browser/ui/views/ime/ime_window_browsertest.cc
@@ -7,6 +7,7 @@
 #include "chrome/browser/ui/ime/ime_native_window.h"
 #include "chrome/browser/ui/ime/ime_window.h"
 #include "chrome/browser/ui/ime/ime_window_observer.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "ui/views/widget/widget.h"
 
@@ -40,7 +41,9 @@ class ImeWindowBrowserTest : public InProcessBrowserTest,
 
   void CreateImeWindow(const gfx::Rect& bounds, bool follow_cursor) {
     ime_window_ = new ImeWindow(
-        browser()->profile(), nullptr, "about:blank",
+        browser()->profile(), nullptr,
+        browser()->tab_strip_model()->GetActiveWebContents()->GetMainFrame(),

[Devlin, 2016/03/02 18:05:11]

Does this RFH make sense as the opener?

[Shu Chen, 2016/03/03 01:33:32]

Done. I've made it nullptr.

+        "about:blank",
         follow_cursor ? ImeWindow::FOLLOW_CURSOR : ImeWindow::NORMAL, bounds);
     ime_window_->AddObserver(this);
     EXPECT_FALSE(ime_window_->ime_native_window()->IsVisible());