Hide mouse cursor when screenshot is taking

ui/snapshot/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 "ui/snapshot/screenshot_grabber.h"
 
 #include <stddef.h>
 
 #include <climits>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "ui/gfx/image/image.h"
 #include "ui/snapshot/snapshot.h"
 
 #if defined(USE_AURA)
+#include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window.h"
 #endif
 
 namespace ui {
 
 namespace {
 // The minimum interval between two screenshot commands.  It has to be
 // more than 1000 to prevent the conflict of filenames.
 const int kScreenshotMinimumIntervalInMS = 1000;
 
@@ skipping 90 matching lines @@
 
   bool is_partial = true;
   // Window identifier is used to log a message on failure to capture a full
   // screen (i.e. non partial) screenshot. The only time is_partial can be
   // false, we will also have an identification string for the window.
   std::string window_identifier;
 #if defined(USE_AURA)
   aura::Window* aura_window = static_cast<aura::Window*>(window);
   is_partial = rect.size() != aura_window->bounds().size();
   window_identifier = aura_window->GetBoundsInScreen().ToString();
+
+  aura::client::CursorClient* cursor_client =
+      aura::client::GetCursorClient(aura_window->GetRootWindow());
+  if (cursor_client)
+    cursor_client->HideCursor();

[sky, 2016/07/21 15:31:42]

Aren't you missing a corresonding Show?

[Qiang(Joe) Xu, 2016/07/21 17:48:26]

Yes. It is missing. I add it now.

 #endif
   ui::GrabWindowSnapshotAsync(
       window, rect, blocking_task_runner_,
       base::Bind(&ScreenshotGrabber::GrabWindowSnapshotAsyncCallback,
                  factory_.GetWeakPtr(), window_identifier, screenshot_path,
                  is_partial));
 }
 
 bool ScreenshotGrabber::CanTakeScreenshot() {
   return last_screenshot_timestamp_.is_null() ||
@@ skipping 46 matching lines @@
 
   ShowNotificationCallback notification_callback(base::Bind(
       &ScreenshotGrabber::NotifyScreenshotCompleted, factory_.GetWeakPtr()));
   client_->PrepareFileAndRunOnBlockingPool(
       screenshot_path, blocking_task_runner_,
       base::Bind(&SaveScreenshot, base::ThreadTaskRunnerHandle::Get(),
                  notification_callback, screenshot_path, png_data));
 }
 
 }  // namespace ui