Add create note palette action.

ash/common/palette_delegate.h

Index: ash/common/palette_delegate.h
diff --git a/ash/common/palette_delegate.h b/ash/common/palette_delegate.h
index d0c96f7b1342955ed589936e4373dd9eaf40c89e..6c5c9ba1e0bdd6bb77432177b5d3d600d33a76ea 100644
--- a/ash/common/palette_delegate.h
+++ b/ash/common/palette_delegate.h
@@ -16,6 +16,12 @@ class PaletteDelegate {
  public:
   virtual ~PaletteDelegate() {}
 
+  // Create a new note.
+  virtual void CreateNote() = 0;
+
+  // Returns true if there is a note-taking application available.
+  virtual bool HasNoteApp() = 0;
+
   // Take a screenshot of the entire window.
   virtual void TakeScreenshot() = 0;