UMA stats for stylus usage

chrome/browser/chromeos/note_taking_app_utils.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 "chrome/browser/chromeos/note_taking_app_utils.h"
 
 #include <string>
 #include <vector>
 
 #include "apps/launcher.h"
 #include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_split.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chromeos/chromeos_switches.h"
+#include "extensions/browser/app_window/app_window.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/api/app_runtime.h"
 #include "extensions/common/extension.h"
 #include "url/gurl.h"
 
 namespace app_runtime = extensions::api::app_runtime;
 
 namespace chromeos {
 namespace {
 
@@ skipping 51 matching lines @@
   if (!app) {
     LOG(ERROR) << "Failed to find note-taking app";
     return;
   }
 
   auto action_data = base::MakeUnique<app_runtime::ActionData>();
   action_data->action_type = app_runtime::ActionType::ACTION_TYPE_NEW_NOTE;
   apps::LaunchPlatformAppWithAction(profile, app, std::move(action_data), path);
 }
 
+bool IsCurrentAppNoteTakingApp(extensions::AppWindow* app_window) {
+  for (const char* id : kExtensionIds) {

[xiyuan, 2016/09/12 20:15:47]

Line 46-54 above seems suggesting that the app ids could be set via command
line. Do we need to consider that as well?

[xiaoyinh(OOO Sep 11-29), 2016/09/16 18:41:15]

Oh, I missed this case. Thanks for pointing that out.

+    if (id == app_window->extension_id())
+      return true;
+  }
+  return false;
+}
+
 }  // namespace chromeos