Handle UNPIN operation 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 6d17c67b43cc8af20001b96aa68f2180bf23f606..5533c6ce57c7564867c0b4173b4229b218da97fb 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -126,6 +126,7 @@ const AcceleratorData kAcceleratorData[] = {
   { false, ui::VKEY_LWIN, ui::EF_NONE, TOGGLE_APP_LIST },
   { true, ui::VKEY_MEDIA_LAUNCH_APP2, ui::EF_NONE, TOGGLE_FULLSCREEN },
   { true, ui::VKEY_MEDIA_LAUNCH_APP2, ui::EF_SHIFT_DOWN, TOGGLE_FULLSCREEN },
+  { true, ui::VKEY_ESCAPE, ui::EF_SHIFT_DOWN | ui::EF_COMMAND_DOWN, UNPIN },

[oshima, 2016/06/18 04:18:13]

New shortcuts should be assigned with search key.
I'm ok to land this as temporary, but please contact UX/PM and discuss which key
this should be assigned.

(I also wonder if Android has something similar/equivalent shortcut)

[hidehiko, 2016/06/18 05:38:17]

I already agreed with UX/PM to use ESC + SHIFT + SEARCH key combination for
this.

   { true, ui::VKEY_L, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, FOCUS_SHELF },
   { true, ui::VKEY_HELP, ui::EF_NONE, SHOW_KEYBOARD_OVERLAY },
   { true, ui::VKEY_OEM_2, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
@@ -557,6 +558,7 @@ const AcceleratorAction kActionsAllowedInPinnedMode[] = {
     TAKE_WINDOW_SCREENSHOT,
     TAKE_PARTIAL_SCREENSHOT,
     TAKE_SCREENSHOT,
+    UNPIN,
 #if defined(OS_CHROMEOS)
     BRIGHTNESS_DOWN,
     BRIGHTNESS_UP,