Implement "pinned" mode in ash.

ash/accelerators/accelerator_table.cc

Index: ash/accelerators/accelerator_table.cc
diff --git a/ash/accelerators/accelerator_table.cc b/ash/accelerators/accelerator_table.cc
index 6dea00ed429a3cd937df4b4af8614af13b548f9f..6d17c67b43cc8af20001b96aa68f2180bf23f606 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -553,4 +553,26 @@ const AcceleratorAction kActionsKeepingMenuOpen[] = {
 
 const size_t kActionsKeepingMenuOpenLength = arraysize(kActionsKeepingMenuOpen);
 
+const AcceleratorAction kActionsAllowedInPinnedMode[] = {

[oshima, 2016/06/18 04:47:44]

This disables accelerators for IME, accessibility etc.

Can't we just use ones for locked state?

[hidehiko, 2016/06/18 05:32:45]

Ah, good point. I shared some with in_app_mode ones.
Though, we should have a bit more, so I keep extra ones in this table.

+    TAKE_WINDOW_SCREENSHOT,
+    TAKE_PARTIAL_SCREENSHOT,
+    TAKE_SCREENSHOT,
+#if defined(OS_CHROMEOS)
+    BRIGHTNESS_DOWN,
+    BRIGHTNESS_UP,
+    KEYBOARD_BRIGHTNESS_DOWN,
+    KEYBOARD_BRIGHTNESS_UP,
+    LOCK_SCREEN,
+    POWER_PRESSED,
+    POWER_RELEASED,
+    SUSPEND,
+    VOLUME_DOWN,
+    VOLUME_MUTE,
+    VOLUME_UP,
+#endif
+};
+
+const size_t kActionsAllowedInPinnedModeLength =
+    arraysize(kActionsAllowedInPinnedMode);
+
 }  // namespace ash