exo: Set source for cursor capture requests.

components/exo/pointer.cc

 // Copyright 2015 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 "components/exo/pointer.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "components/exo/pointer_delegate.h"
@@ skipping 34 matching lines @@
 }
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // Pointer, public:
 
 Pointer::Pointer(PointerDelegate* delegate)
     : delegate_(delegate),
       cursor_(ui::kCursorNull),
+      cursor_capture_source_id_(base::UnguessableToken::Create()),
       cursor_capture_weak_ptr_factory_(this) {
   auto* helper = WMHelper::GetInstance();
   helper->AddPreTargetHandler(this);
   helper->AddCursorObserver(this);
 }
 
 Pointer::~Pointer() {
   delegate_->OnPointerDestroying(this);
   if (surface_)
     surface_->RemoveSurfaceObserver(this);
@@ skipping 268 matching lines @@
 
   std::unique_ptr<cc::CopyOutputRequest> request =
       cc::CopyOutputRequest::CreateBitmapRequest(
           base::Bind(&Pointer::OnCursorCaptured,
                      cursor_capture_weak_ptr_factory_.GetWeakPtr(),
                      gfx::ScaleToFlooredPoint(
                          hotspot_,
                          // |hotspot_| is in surface coordinate space so apply
                          // both device scale and UI scale.
                          cursor_scale_ * primary_device_scale_factor)));
+  request->set_source(cursor_capture_source_id_);
   surface_->window()->layer()->RequestCopyOfOutput(std::move(request));
 }
 
 void Pointer::OnCursorCaptured(const gfx::Point& hotspot,
                                std::unique_ptr<cc::CopyOutputResult> result) {
   if (!focus_)
     return;
 
   cursor_ = ui::kCursorNone;
   if (!result->IsEmpty()) {
@@ skipping 25 matching lines @@
 void Pointer::UpdateCursor() {
   DCHECK(focus_);
 
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(focus_->window()->GetRootWindow());
   if (cursor_client)
     cursor_client->SetCursor(cursor_);
 }
 
 }  // namespace exo