Use std::unique_ptr to signal ownership transfer in WebCompositorSupport

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 25 matching lines @@
 #include "base/metrics/statistics_recorder.h"
 #include "base/test/icu_test_util.h"
 #include "base/test/test_discardable_memory_allocator.h"
 #include "cc/blink/web_compositor_support_impl.h"
 #include "cc/test/ordered_simple_task_runner.h"
 #include "platform/HTTPNames.h"
 #include "platform/heap/Heap.h"
 #include "platform/scheduler/base/test_time_source.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate_for_test.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
+#include "public/platform/WebContentLayer.h"
+#include "public/platform/WebExternalTextureLayer.h"
+#include "public/platform/WebImageLayer.h"
+#include "public/platform/WebScrollbarLayer.h"
 #include "wtf/CryptographicallyRandomNumber.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/WTF.h"
 #include "wtf/allocator/Partitions.h"
 #include <memory>
 
 namespace blink {
 
 namespace {
 
 double dummyCurrentTime() {
   return 0.0;
 }
 
 class DummyThread final : public blink::WebThread {
  public:
   bool isCurrentThread() const override { return true; }
   blink::WebScheduler* scheduler() const override { return nullptr; }
 };
 
 }  // namespace
 
+std::unique_ptr<WebLayer> TestingCompositorSupport::createLayer() {
+  return nullptr;
+}
+
+std::unique_ptr<WebLayer> TestingCompositorSupport::createLayerFromCCLayer(
+    cc::Layer*) {
+  return nullptr;
+}
+
+std::unique_ptr<WebContentLayer> TestingCompositorSupport::createContentLayer(
+    WebContentLayerClient*) {
+  return nullptr;
+}
+std::unique_ptr<WebExternalTextureLayer>
+TestingCompositorSupport::createExternalTextureLayer(cc::TextureLayerClient*) {
+  return nullptr;
+}
+
+std::unique_ptr<WebImageLayer> TestingCompositorSupport::createImageLayer() {
+  return nullptr;
+}
+
+std::unique_ptr<WebScrollbarLayer>
+TestingCompositorSupport::createScrollbarLayer(
+    std::unique_ptr<WebScrollbar>,
+    WebScrollbarThemePainter,
+    std::unique_ptr<WebScrollbarThemeGeometry>) {
+  return nullptr;
+}
+
+std::unique_ptr<WebScrollbarLayer>
+TestingCompositorSupport::createSolidColorScrollbarLayer(
+    WebScrollbar::Orientation,
+    int thumbThickness,
+    int trackStart,
+    bool isLeftSideVerticalScrollbar) {
+  return nullptr;
+}
+
 TestingPlatformSupport::TestingPlatformSupport()
     : TestingPlatformSupport(TestingPlatformSupport::Config()) {}
 
 TestingPlatformSupport::TestingPlatformSupport(const Config& config)
     : m_config(config), m_oldPlatform(Platform::current()) {
   ASSERT(m_oldPlatform);
   Platform::setCurrentPlatformForTesting(this);
 }
 
 TestingPlatformSupport::~TestingPlatformSupport() {
@@ skipping 162 matching lines @@
   ProcessHeap::init();
   ThreadState::attachMainThread();
   ThreadState::current()->registerTraceDOMWrappers(nullptr, nullptr, nullptr,
                                                    nullptr);
   HTTPNames::init();
 }
 
 ScopedUnittestsEnvironmentSetup::~ScopedUnittestsEnvironmentSetup() {}
 
 }  // namespace blink