Add MemoryCoordinator

content/browser/memory/memory_state_notifier_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/command_line.h"
+#include "base/run_loop.h"
+#include "components/memory_coordinator/browser/memory_state_notifier.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 MemoryStateNotifierTest : public ContentBrowserTest {
+ public:
+  MemoryStateNotifierTest() {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    base::CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kEnableMemoryCoordinator);
+  }
+
+ protected:
+  memory_coordinator::MemoryStateNotifier* memory_state_notifier() {
+    return BrowserMainLoop::GetInstance()->memory_state_notifier();
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(MemoryStateNotifierTest);
+};
+
+class LastStateChecker {
+ public:
+  explicit LastStateChecker(memory_coordinator::MemoryStateNotifier* notifier)
+      : notifier_(notifier) {}
+  ~LastStateChecker() {}
+
+  void Check(memory_coordinator::mojom::MemoryState expected) {
+    DCHECK(notifier_);
+    notifier_->IterateChildren(base::Bind(&LastStateChecker::GetLastState,
+                                          base::Unretained(this), expected));
+    run_loop_.Run();
+  }
+
+ private:
+  void GetLastState(
+      memory_coordinator::mojom::MemoryState expected,
+      memory_coordinator::mojom::ChildMemoryCoordinatorPtr& child) {
+    ++num_children_;
+    child->GetLastState(base::Bind(&LastStateChecker::AppendLastState,
+                                   base::Unretained(this), expected));
+  }
+
+  void AppendLastState(memory_coordinator::mojom::MemoryState expected,
+                       memory_coordinator::mojom::MemoryState actual) {
+    EXPECT_EQ(expected, actual);
+    if (--num_children_ == 0) {
+      run_loop_.QuitWhenIdle();
+    }
+  }
+
+  memory_coordinator::MemoryStateNotifier* notifier_ = nullptr;
+  base::RunLoop run_loop_;
+  size_t num_children_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(LastStateChecker);
+};
+
+
+IN_PROC_BROWSER_TEST_F(MemoryStateNotifierTest, Throttled) {
+  GURL url = GetTestUrl("", "simple_page.html");
+  NavigateToURL(shell(), url);
+  memory_state_notifier()->Notify(
+      memory_coordinator::mojom::MemoryState::THROTTLED);
+
+  LastStateChecker checker(memory_state_notifier());
+  checker.Check(memory_coordinator::mojom::MemoryState::THROTTLED);
+}
+
+}  // namespace content