Add palette tray to ash.

ash/common/system/chromeos/palette/palette_tool_manager.cc

 // 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.
 
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
 
 #include <algorithm>
 
 #include "ash/common/system/chromeos/palette/palette_tool.h"
 #include "base/bind.h"
@@ skipping 54 matching lines @@
 }
 
 PaletteToolId PaletteToolManager::GetActiveTool(PaletteGroup group) {
   PaletteTool* active_tool = active_tools_[group];
   return active_tool ? active_tool->GetToolId() : PaletteToolId::NONE;
 }
 
 gfx::VectorIconId PaletteToolManager::GetActiveTrayIcon(PaletteToolId tool_id) {
   PaletteTool* tool = FindToolById(tool_id);
   if (!tool)
-    return gfx::VectorIconId::VECTOR_ICON_NONE;
+    return gfx::VectorIconId::PALETTE_TRAY_ICON_DEFAULT;
 
   return tool->GetActiveTrayIcon();
 }
 
 std::vector<PaletteToolView> PaletteToolManager::CreateViews() {
   std::vector<PaletteToolView> views(tools_.size());
 
   for (size_t i = 0; i < tools_.size(); ++i) {
     PaletteToolView* view = &views[i];
     view->group = tools_[i]->GetGroup();
@@ skipping 28 matching lines @@
 PaletteTool* PaletteToolManager::FindToolById(PaletteToolId tool_id) {
   for (std::unique_ptr<PaletteTool>& tool : tools_) {
     if (tool->GetToolId() == tool_id)
       return tool.get();
   }
 
   return nullptr;
 }
 
 }  // namespace ash