Fix CompositorResizeLock to do something.

content/browser/renderer_host/compositor_resize_lock_unittest.cc

+// Copyright 2017 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 "content/browser/renderer_host/compositor_resize_lock.h"
+
+#include "base/memory/ptr_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/compositor/test/fake_compositor_lock.h"
+
+namespace content {
+namespace {
+
+class FakeCompositorResizeLockClient
+    : public CompositorResizeLockClient,
+      public NON_EXPORTED_BASE(ui::CompositorLockDelegate) {
+ public:
+  FakeCompositorResizeLockClient() {}
+
+  std::unique_ptr<ui::CompositorLock> GetCompositorLock(
+      ui::CompositorLockClient* client) override {
+    created_ = true;
+    compositor_lock_ = new ui::FakeCompositorLock(client, this);
+    return base::WrapUnique(compositor_lock_);
+  }
+
+  // CompositorResizeLockClient implementation.
+  void CompositorResizeLockEnded() override {
+    // This informs when the CompositorResizeLock ends for the client to
+    // release anything else it is holding.
+    ended_ = true;
+  }
+
+  // CompositorLockDelegate implementation.
+  void RemoveCompositorLock(ui::CompositorLock* lock) override {
+    // This is where the ui::Compositor would be physically unlocked.
+    unlocked_ = true;
+  }
+
+  void CauseTimeout() { compositor_lock_->TimeoutLock(); }
+
+  bool created() const { return created_; }
+  bool unlocked() const { return unlocked_; }
+  bool ended() const { return ended_; }
+
+ private:
+  bool created_ = false;
+  bool unlocked_ = false;
+  bool ended_ = false;
+  ui::FakeCompositorLock* compositor_lock_ = nullptr;
+};
+
+TEST(CompositorResizeLockTest, EndWithoutLock) {
+  FakeCompositorResizeLockClient resize_client;
+  gfx::Size resize_to(10, 11);
+
+  {
+    CompositorResizeLock resize_lock(&resize_client, resize_to);
+    EXPECT_FALSE(resize_client.created());
+    EXPECT_FALSE(resize_client.unlocked());
+    EXPECT_FALSE(resize_client.ended());
+  }
+  // The compositor was never locked.
+  EXPECT_FALSE(resize_client.unlocked());
+  // The resize lock tells the client when it is destroyed.
+  EXPECT_TRUE(resize_client.ended());
+}
+
+TEST(CompositorResizeLockTest, EndAfterLock) {
+  FakeCompositorResizeLockClient resize_client;
+  gfx::Size resize_to(10, 11);
+
+  {
+    CompositorResizeLock resize_lock(&resize_client, resize_to);
+    EXPECT_FALSE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+
+    resize_lock.Lock();
+    EXPECT_TRUE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+  }
+  // The resize lock unlocks the compositor when it ends.
+  EXPECT_TRUE(resize_client.unlocked());
+  // The resize lock tells the client when it ends.
+  EXPECT_TRUE(resize_client.ended());
+}
+
+TEST(CompositorResizeLockTest, EndAfterUnlock) {
+  FakeCompositorResizeLockClient resize_client;
+  gfx::Size resize_to(10, 11);
+
+  {
+    CompositorResizeLock resize_lock(&resize_client, resize_to);
+    EXPECT_FALSE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+
+    resize_lock.Lock();
+    EXPECT_TRUE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+
+    // Unlocking the compositor but keeping the resize lock.
+    resize_lock.UnlockCompositor();
+    EXPECT_TRUE(resize_client.unlocked());
+    EXPECT_FALSE(resize_client.ended());
+  }
+  // The resize lock tells the client when it ends.
+  EXPECT_TRUE(resize_client.ended());
+}
+
+TEST(CompositorResizeLockTest, EndAfterTimeout) {
+  FakeCompositorResizeLockClient resize_client;
+  gfx::Size resize_to(10, 11);
+
+  {
+    CompositorResizeLock resize_lock(&resize_client, resize_to);
+    EXPECT_FALSE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+
+    resize_lock.Lock();
+    EXPECT_TRUE(resize_client.created());
+    EXPECT_FALSE(resize_client.ended());
+
+    // A timeout tells the client that the lock ended.
+    resize_client.CauseTimeout();
+    EXPECT_TRUE(resize_client.unlocked());
+    EXPECT_TRUE(resize_client.ended());
+  }
+}
+
+}  // namespace
+}  // namespace content