Fix calculation of usable area of screen when VK is shown.

ui/keyboard/keyboard_controller_proxy.cc

Index: ui/keyboard/keyboard_controller_proxy.cc
diff --git a/ui/keyboard/keyboard_controller_proxy.cc b/ui/keyboard/keyboard_controller_proxy.cc
index 4a0dd4f6fe2010ffc0e83b42ee05e488e4b5f9e5..f1df00499f915f9eb2c06ab471122b43118b8461 100644
--- a/ui/keyboard/keyboard_controller_proxy.cc
+++ b/ui/keyboard/keyboard_controller_proxy.cc
@@ -15,6 +15,8 @@
 #include "content/public/common/bindings_policy.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/text_input_client.h"
 #include "ui/keyboard/keyboard_constants.h"
 #include "ui/keyboard/keyboard_switches.h"
 #include "ui/keyboard/keyboard_util.h"
@@ -142,6 +144,15 @@ void KeyboardControllerProxy::SetUpdateInputType(ui::TextInputType type) {
 }
 
 void KeyboardControllerProxy::EnsureCaretInWorkArea() {
+  if (GetInputMethod()->GetTextInputClient()) {
+    aura::Window* keyboard_window = GetKeyboardWindow();
+    aura::Window* root_window = keyboard_window->GetRootWindow();
+    gfx::Rect available_bounds = root_window->bounds();
+    gfx::Rect keyboard_bounds = keyboard_window->bounds();
+    available_bounds.set_height(available_bounds.height() -
+        keyboard_bounds.height());
+    GetInputMethod()->GetTextInputClient()->EnsureCaretInRect(available_bounds);
+  }
 }
 
 void KeyboardControllerProxy::LoadSystemKeyboard() {