Add a full screen virtual keyboard to virtual keyboard root window

ash/display/virtual_keyboard_window_controller_unittest.cc

+#include "ash/display/virtual_keyboard_window_controller.h"
+
+#include "ash/ash_switches.h"
+#include "ash/display/display_controller.h"
+#include "ash/root_window_controller.h"
+#include "ash/shell.h"
+#include "ash/shell_window_ids.h"
+#include "ash/test/ash_test_base.h"
+#include "base/command_line.h"
+#include "ui/keyboard/keyboard_switches.h"
+
+namespace ash {
+namespace {
+
+class VirtualKeyboardWindowControllerTest : public test::AshTestBase {
+ public:
+  VirtualKeyboardWindowControllerTest() {}
+  virtual ~VirtualKeyboardWindowControllerTest() {}
+
+  virtual void SetUp() OVERRIDE {
+    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+        switches::kAshHostWindowBounds, "1+1-300x300,1+301-300x300");
+    CommandLine::ForCurrentProcess()->AppendSwitch(
+        keyboard::switches::kKeyboardUsabilityTest);
+    test::AshTestBase::SetUp();
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VirtualKeyboardWindowControllerTest);
+};
+
+}  // namespace
+
+TEST_F(VirtualKeyboardWindowControllerTest, VirtualKeyboardWindowTest) {
+  if (!SupportsMultipleDisplays())
+    return;
+  RunAllPendingInMessageLoop();
+  internal::RootWindowController* root_window_controller =
+      Shell::GetInstance()->display_controller()->
+          virtual_keyboard_window_controller()->root_window_controller();
+  EXPECT_TRUE(root_window_controller);
+  // Keyboard container is added to virtual keyboard window.
+  EXPECT_TRUE(root_window_controller->GetContainer(
+      internal::kShellWindowId_VirtualKeyboardContainer));
+}
+
+}  // namespace ash