Make the virtual keyboard show up on the display with input focus.

ui/keyboard/keyboard_layout_delegate.h

Index: ui/keyboard/keyboard_layout_delegate.h
diff --git a/ui/keyboard/keyboard_layout_delegate.h b/ui/keyboard/keyboard_layout_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..685e83712dde41dd846d28be34e85a572e3bca0a
--- /dev/null
+++ b/ui/keyboard/keyboard_layout_delegate.h
@@ -0,0 +1,27 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.

[oshima, 2016/11/08 17:26:05]

remove "(c)" Old files may have it, but it's obsolete.

[yhanada, 2016/11/14 22:48:47]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_KEYBOARD_KEYBOARD_LAYOUT_DELEGATE_H_
+#define UI_KEYBOARD_KEYBOARD_LAYOUT_DELEGATE_H_
+
+#include <stdint.h>
+
+#include "ui/keyboard/keyboard_export.h"
+
+namespace keyboard {
+
+// A delegate class to control the virtual keyboard layout
+class KEYBOARD_EXPORT KeyboardLayoutDelegate {
+ public:
+  virtual ~KeyboardLayoutDelegate() {}
+
+  // If display_id != |kInvalidDisplayID|, move the keyboard to that display.
+  // If display_id == |kInvalidDisplayID|, move the keyboard to the touchable
+  // display which has the input focus, or the first touchable display.
+  virtual void MoveKeyboardToAnotherDisplayIfNeeded(int64_t display_id) = 0;

[oshima, 2016/11/08 17:26:05]

Since the caller knows which, it's better to have separate method for these two
conditions.

[yhanada, 2016/11/14 22:48:47]

Done.

+};
+
+}  // namespace keyboard
+
+#endif