Log when a successful screenshot is taken on ChromeOS

Bug: 854001
Change-Id: I7d463aae233fd9704b4e1af58e9a8e7596aa76f7
Reviewed-on: https://chromium-review.googlesource.com/1105504Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Nick Peterson <nrpeter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568532}

chrome/browser/ui/ash/chrome_screenshot_grabber.cc

@@ -22,6 +22,7 @@
 #include "base/metrics/user_metrics.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/syslog_logging.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
@@ -539,6 +540,10 @@ void ChromeScreenshotGrabber::OnScreenshotCompleted(
     return;
   }
 
+#if defined(OS_CHROMEOS)
+  SYSLOG(INFO) << "Screenshot taken";
+#endif
+
   if (drive::util::IsUnderDriveMountPoint(screenshot_path)) {
     drive::FileSystemInterface* file_system =
         drive::util::GetFileSystemByProfile(GetProfile());

extensions/browser/api/web_contents_capture_client.cc

@@ -6,6 +6,7 @@
 
 #include "base/base64.h"
 #include "base/strings/stringprintf.h"
+#include "base/syslog_logging.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
@@ -54,6 +55,11 @@ WebContentsCaptureClient::CaptureResult WebContentsCaptureClient::CaptureAsync(
   view->CopyFromSurface(gfx::Rect(),  // Copy entire surface area.
                         gfx::Size(),  // Result contains device-level detail.
                         std::move(callback));
+
+#if defined(OS_CHROMEOS)
+  SYSLOG(INFO) << "Screenshot taken";
+#endif
+
   return OK;
 }