Add a full Blimp integration test.

blimp/client/test/compositor/test_display_compositor.cc

+// Copyright 2016 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 "blimp/client/test/compositor/test_display_compositor.h"
+
+#include <memory>
+
+#include "base/synchronization/waitable_event.h"
+#include "blimp/client/public/compositor/compositor_dependencies.h"
+#include "blimp/client/support/compositor/blimp_context_provider.h"
+#include "cc/layers/layer.h"
+#include "cc/output/copy_output_request.h"
+#include "cc/output/copy_output_result.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace blimp {
+namespace client {
+
+namespace {
+void OnReadbackComplete(TestDisplayCompositor::CopyRequest* copy_request,
+                        std::unique_ptr<cc::CopyOutputResult> result) {
+  copy_request->result = result->TakeBitmap();
+  copy_request->waiter.Signal();
+}
+}  // namespace
+
+TestDisplayCompositor::CopyRequest::CopyRequest()
+    : waiter(base::WaitableEvent::ResetPolicy::MANUAL,
+             base::WaitableEvent::InitialState::NOT_SIGNALED) {}
+
+TestDisplayCompositor::CopyRequest::~CopyRequest() = default;
+
+TestDisplayCompositor::TestDisplayCompositor(
+    CompositorDependencies* compositor_dependencies)
+    : DisplayCompositor(compositor_dependencies) {
+  SetContextProvider(BlimpContextProvider::Create(
+      gfx::kNullAcceleratedWidget,
+      compositor_dependencies->GetGpuMemoryBufferManager()));
+}
+
+TestDisplayCompositor::~TestDisplayCompositor() = default;
+
+void TestDisplayCompositor::GetBitmap(CopyRequest* copy_request) {
+  std::unique_ptr<cc::CopyOutputRequest> request =
+      cc::CopyOutputRequest::CreateBitmapRequest(
+          base::Bind(&OnReadbackComplete, copy_request));
+  root_layer()->RequestCopyOfOutput(std::move(request));
+}
+
+}  // namespace client
+}  // namespace blimp