ash/chromeos: Add shift-alt-p shortcut to open palette.

chrome/browser/ui/ash/palette_delegate_chromeos.cc

Index: chrome/browser/ui/ash/palette_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/palette_delegate_chromeos.cc b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
index 3192f8b4bfe9ba1cef05121b3f5c968977d1497f..8a1d2648402f454cc4d27e4854000475f7b33b04 100644
--- a/chrome/browser/ui/ash/palette_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/palette_delegate_chromeos.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/ui/ash/palette_delegate_chromeos.h"
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
+#include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
@@ -24,6 +25,13 @@
 
 namespace chromeos {
 
+// static
+std::unique_ptr<PaletteDelegateChromeOS> PaletteDelegateChromeOS::Create() {
+  if (!ash::IsPaletteFeatureEnabled())
+    return nullptr;
+  return base::WrapUnique(new PaletteDelegateChromeOS());
+}
+
 PaletteDelegateChromeOS::PaletteDelegateChromeOS() {
   registrar_.Add(this, chrome::NOTIFICATION_SESSION_STARTED,
                  content::NotificationService::AllSources());
@@ -134,6 +142,13 @@ bool PaletteDelegateChromeOS::ShouldAutoOpenPalette() {
   return profile_->GetPrefs()->GetBoolean(prefs::kLaunchPaletteOnEjectEvent);
 }
 
+bool PaletteDelegateChromeOS::ShouldShowPalette() {
+  if (!profile_)
+    return false;
+
+  return profile_->GetPrefs()->GetBoolean(prefs::kEnableStylusTools);
+}
+
 void PaletteDelegateChromeOS::TakeScreenshot() {
   auto* screenshot_delegate = ash::Shell::GetInstance()
                                   ->accelerator_controller_delegate()