Show the cursor if it was hidden when starting partical screenshot.

ash/utility/partial_screenshot_controller.cc

Index: ash/utility/partial_screenshot_controller.cc
diff --git a/ash/utility/partial_screenshot_controller.cc b/ash/utility/partial_screenshot_controller.cc
index f2406d99abd91fee0bc57536e4ca6839928ed050..210017f02125860ef76a2b290084f71283136336 100644
--- a/ash/utility/partial_screenshot_controller.cc
+++ b/ash/utility/partial_screenshot_controller.cc
@@ -95,9 +95,11 @@ class PartialScreenshotController::ScopedCursorSetter {
     gfx::NativeCursor original_cursor = cursor_manager->GetCursor();
     cursor_manager_ = cursor_manager;
     cursor_manager_->SetCursor(cursor);
+    if (!cursor_manager_->IsCursorVisible())
+      cursor_manager_->ShowCursor();
     cursor_manager_->LockCursor();
-    // SetCursor does not make any effects at this point but it sets back to the
-    // original cursor when unlocked.
+    // SetCursor does not make any effects at this point but it sets back to
+    // the original cursor when unlocked.
     cursor_manager_->SetCursor(original_cursor);
   }