Add power-user keyboard mode for ChromeOS with Search key acting as a typical Fn key.

ash/accelerators/accelerator_controller_unittest.cc

Index: ash/accelerators/accelerator_controller_unittest.cc
diff --git a/ash/accelerators/accelerator_controller_unittest.cc b/ash/accelerators/accelerator_controller_unittest.cc
index 7012f4f33aa2bcffbfd6ba162e1444b2e2ffa1cb..f8668d22b405f458b9e6eb785c34ac42be80d152 100644
--- a/ash/accelerators/accelerator_controller_unittest.cc
+++ b/ash/accelerators/accelerator_controller_unittest.cc
@@ -631,11 +631,17 @@ TEST_F(AcceleratorControllerTest, GlobalAccelerators) {
   // ToggleAppList
   {
     EXPECT_FALSE(ash::Shell::GetInstance()->GetAppListTargetVisibility());
-    EXPECT_TRUE(ProcessWithContext(
+    // Pressing the search key should do nothing, since the Search key can be
+    // used as a modifier for accessing extended keyboard shortcuts.
+    EXPECT_FALSE(ProcessWithContext(
         ui::Accelerator(ui::VKEY_LWIN, ui::EF_NONE)));
-    EXPECT_TRUE(ash::Shell::GetInstance()->GetAppListTargetVisibility());
     EXPECT_TRUE(ProcessWithContext(
+        ReleaseAccelerator(ui::VKEY_LWIN, ui::EF_NONE)));
+    EXPECT_TRUE(ash::Shell::GetInstance()->GetAppListTargetVisibility());
+    EXPECT_FALSE(ProcessWithContext(
         ui::Accelerator(ui::VKEY_LWIN, ui::EF_NONE)));
+    EXPECT_TRUE(ProcessWithContext(
+        ReleaseAccelerator(ui::VKEY_LWIN, ui::EF_NONE)));
     EXPECT_FALSE(ash::Shell::GetInstance()->GetAppListTargetVisibility());
   }
   // ToggleAppList (with spoken feedback enabled)
@@ -644,9 +650,13 @@ TEST_F(AcceleratorControllerTest, GlobalAccelerators) {
     delegate->ToggleSpokenFeedback();
     EXPECT_FALSE(ProcessWithContext(
         ui::Accelerator(ui::VKEY_LWIN, ui::EF_NONE)));
+    EXPECT_FALSE(ProcessWithContext(
+        ReleaseAccelerator(ui::VKEY_LWIN, ui::EF_NONE)));
     delegate->ToggleSpokenFeedback();
-    EXPECT_TRUE(ProcessWithContext(
+    EXPECT_FALSE(ProcessWithContext(
         ui::Accelerator(ui::VKEY_LWIN, ui::EF_NONE)));
+    EXPECT_TRUE(ProcessWithContext(
+        ReleaseAccelerator(ui::VKEY_LWIN, ui::EF_NONE)));
   }
   // DisableCapsLock
   {