Add MemoryCoordinator

content/browser/memory/memory_coordinator_browsertest.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 "base/run_loop.h"
+#include "components/memory_coordinator/browser/memory_coordinator.h"
+#include "components/memory_coordinator/common/memory_coordinator_features.h"
+#include "content/browser/browser_main_loop.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/test/content_browser_test.h"
+#include "content/public/test/content_browser_test_utils.h"
+
+namespace content {
+
+class MemoryCoordinatorTest : public ContentBrowserTest {
+ public:
+  MemoryCoordinatorTest() {}
+
+  void SetUp() override {
+    memory_coordinator::EnableForTesting();
+    ContentBrowserTest::SetUp();
+  }
+
+  void NotifyState(memory_coordinator::mojom::MemoryState state) {
+    memory_coordinator()->IterateChildrenForTesting(
+        base::Bind(&MemoryCoordinatorTest::NotifyStateToChild,
+                   base::Unretained(this), state));
+  }
+
+ protected:
+  memory_coordinator::MemoryCoordinator* memory_coordinator() {
+    return BrowserMainLoop::GetInstance()->memory_coordinator();
+  }
+
+  void NotifyStateToChild(
+      memory_coordinator::mojom::MemoryState state,
+      memory_coordinator::mojom::ChildMemoryCoordinator* child) {
+    child->OnStateChange(state);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryCoordinatorTest);
+};
+
+class LastStateChecker {
+ public:
+  explicit LastStateChecker(
+      memory_coordinator::MemoryCoordinator* coordinator)
+      : coordinator_(coordinator) {}
+  ~LastStateChecker() {}
+
+  void Check(memory_coordinator::mojom::MemoryState expected) {
+    DCHECK(coordinator_);
+    coordinator_->IterateChildrenForTesting(base::Bind(
+        &LastStateChecker::GetChildState, base::Unretained(this), expected));
+    run_loop_.Run();
+  }
+
+ private:
+  void GetChildState(memory_coordinator::mojom::MemoryState expected,
+                     memory_coordinator::mojom::ChildMemoryCoordinator* child) {
+    ++num_children_;
+    child->GetCurrentStateForTesting(
+        base::Bind(&LastStateChecker::CheckLastStateForChild,
+                   base::Unretained(this), expected));
+  }
+
+  void CheckLastStateForChild(memory_coordinator::mojom::MemoryState expected,
+                              memory_coordinator::mojom::MemoryState actual) {
+    EXPECT_EQ(expected, actual);
+    if (--num_children_ == 0) {
+      run_loop_.QuitWhenIdle();
+    }
+  }
+
+  memory_coordinator::MemoryCoordinator* coordinator_ = nullptr;
+  base::RunLoop run_loop_;
+  size_t num_children_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(LastStateChecker);
+};
+
+IN_PROC_BROWSER_TEST_F(MemoryCoordinatorTest, Throttled) {
+  GURL url = GetTestUrl("", "simple_page.html");
+  NavigateToURL(shell(), url);
+  NotifyState(memory_coordinator::mojom::MemoryState::THROTTLED);
+
+  LastStateChecker checker(memory_coordinator());
+  checker.Check(memory_coordinator::mojom::MemoryState::THROTTLED);
+}
+
+}  // namespace content