chromeos: Add Screenshot_Annotate metric.

chrome/browser/ui/ash/chrome_screenshot_grabber.cc

 // Copyright 2014 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/ui/ash/chrome_screenshot_grabber.h"
 
 #include <stddef.h>
 
 #include "ash/common/strings/grit/ash_strings.h"
 #include "ash/common/system/system_notifier.h"
@@ skipping 118 matching lines @@
           file_system->GetFile(drive::util::ExtractDrivePath(screenshot_path_),
                                base::Bind(&ReadFileAndCopyToClipboardDrive));
           return;
         }
         content::BrowserThread::GetBlockingPool()->PostTask(
             FROM_HERE,
             base::Bind(&ReadFileAndCopyToClipboardLocal, screenshot_path_));
         break;
       }
       case BUTTON_ANNOTATE: {
-        if (chromeos::IsNoteTakingAppAvailable(profile_))
+        if (chromeos::IsNoteTakingAppAvailable(profile_)) {
           chromeos::LaunchNoteTakingAppForNewNote(profile_, screenshot_path_);
+          content::RecordAction(base::UserMetricsAction("Screenshot_Annotate"));
+        }
         break;
       }
       default:
         NOTREACHED() << "Unhandled button index " << button_index;
     }
   }
   bool HasClickedListener() override { return success_; }
   std::string id() const override { return std::string(kNotificationId); }
 
  private:
@@ skipping 311 matching lines @@
 }
 
 void ChromeScreenshotGrabber::SetProfileForTest(Profile* profile) {
   profile_for_test_ = profile;
 }
 
 Profile* ChromeScreenshotGrabber::GetProfile() {
   return profile_for_test_ ? profile_for_test_
                            : ProfileManager::GetActiveUserProfile();
 }