Add UMA stats for pen palette

ash/common/system/chromeos/palette/palette_tool.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_TOOL_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_TOOL_H_
 
 #include <map>
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
+#include "ash/common/system/chromeos/palette/palette_ids.h"
 #include "base/callback.h"
 #include "base/macros.h"
 #include "ui/gfx/vector_icon_types.h"
 
 namespace gfx {
 struct VectorIcon;
 }
 
 namespace views {
 class View;
@@ skipping 22 matching lines @@
     // Enable or disable a specific tool.
     virtual void EnableTool(PaletteToolId tool_id) = 0;
     virtual void DisableTool(PaletteToolId tool_id) = 0;
 
     // Hide the entire palette. This should not change any tool state.
     virtual void HidePalette() = 0;
 
     // Returns the root window.
     virtual WmWindow* GetWindow() = 0;
 
+    // Record usage of each pen palette option.
+    virtual void RecordPaletteOptionsUsage(PaletteTrayOptions option) = 0;
+
+    // Record mode cancellation of pen palette.
+    virtual void RecordPaletteModeCancellation(PaletteModeCancelType type) = 0;
+
    private:
     DISALLOW_COPY_AND_ASSIGN(Delegate);
   };
 
   // Adds all available PaletteTool instances to the tool_manager.
   static void RegisterToolInstances(PaletteToolManager* tool_manager);
 
   // |delegate| must outlive this tool instance.
   explicit PaletteTool(Delegate* delegate);
   virtual ~PaletteTool();
@@ skipping 36 matching lines @@
 
   // Unowned pointer to the delegate. The delegate should outlive this instance.
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PaletteTool);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_PALETTE_PALETTE_TOOL_H_