Added browser tests to test the BudgetAPI. Also added BudgetAPI to ExperimentalWebPlatformFeatures.

chrome/browser/budget_service/budget_manager_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/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/run_loop.h"
+#include "chrome/browser/budget_service/budget_manager.h"
+#include "chrome/browser/budget_service/budget_manager_factory.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/common/content_switches.h"
+#include "content/public/test/browser_test_utils.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "third_party/WebKit/public/platform/modules/budget_service/budget_service.mojom.h"
+#include "url/origin.h"
+
+namespace {
+
+// const char kManifestSenderId[] = "1234567890";

[Peter Beverloo, 2016/09/27 15:57:47]

nit: delete commented out code

[harkness, 2016/09/28 12:29:20]

Done.

+
+}  // namespace

[Peter Beverloo, 2016/09/27 15:57:47]

Since you don't need `friends` declarations, can we hoist this entire file in
the anonymous namespace?

[harkness, 2016/09/28 12:29:21]

Done.

+
+class BudgetManagerBrowserTest : public InProcessBrowserTest {
+ public:
+  BudgetManagerBrowserTest() {}
+  ~BudgetManagerBrowserTest() override {}

[Peter Beverloo, 2016/09/27 15:57:47]

nit: {}  -->  " = default;"

for both the constructor and destructor

[harkness, 2016/09/28 12:29:20]

Done.

+
+  // InProcessBrowserTest:
+  void SetUp() override {
+    https_server_.reset(
+        new net::EmbeddedTestServer(net::EmbeddedTestServer::TYPE_HTTPS));
+    https_server_->ServeFilesFromSourceDirectory("chrome/test/data");
+    ASSERT_TRUE(https_server_->Start());
+
+    InProcessBrowserTest::SetUp();
+  }
+
+  // InProcessBrowserTest:
+  void SetUpOnMainThread() override {
+    LoadTestPage();
+    InProcessBrowserTest::SetUpOnMainThread();
+    budget_manager_ =
+        BudgetManagerFactory::GetForProfile(GetBrowser()->profile());
+  }
+
+  // InProcessBrowserTest:
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    command_line->AppendSwitch(

[Peter Beverloo, 2016/09/27 15:57:47]

nit: add a TODO w/ a bug reference to remove this once we ship

[harkness, 2016/09/28 12:29:20]

Done.

+        switches::kEnableExperimentalWebPlatformFeatures);
+    InProcessBrowserTest::SetUpCommandLine(command_line);
+  }
+
+  bool RunScript(const std::string& script, std::string* result) {
+    content::WebContents* web_contents =
+        GetBrowser()->tab_strip_model()->GetActiveWebContents();
+    return content::ExecuteScriptAndExtractString(web_contents->GetMainFrame(),
+                                                  script, result);
+  }
+
+  void LoadTestPage() {
+    ui_test_utils::NavigateToURL(GetBrowser(),
+                                 https_server_->GetURL(GetTestURL()));
+  }
+
+  void DidConsume(base::Closure run_loop_closure, bool success) {
+    success_ = success;
+    run_loop_closure.Run();
+  }
+
+  void ConsumeReservation() {
+    base::RunLoop run_loop;
+    budget_manager()->Consume(
+        url::Origin(https_server_->GetURL(GetTestURL())),
+        blink::mojom::BudgetOperationType::SILENT_PUSH,
+        base::Bind(&BudgetManagerBrowserTest::DidConsume,
+                   base::Unretained(this), run_loop.QuitClosure()));
+    run_loop.Run();
+  }
+
+  BudgetManager* budget_manager() const { return budget_manager_; }
+  bool success() const { return success_; }
+
+ protected:
+  virtual std::string GetTestURL() { return "/budget_service/test.html"; }
+  virtual Browser* GetBrowser() const { return browser(); }

[Peter Beverloo, 2016/09/27 15:57:47]

These two don't have to be virtual? Why do they exist at all?

I think GetTestURL can just be a constant, and use browser() instead of
GetBrowser().

[harkness, 2016/09/28 12:29:20]

Done.

+
+  std::unique_ptr<net::EmbeddedTestServer> https_server_;
+  BudgetManager* budget_manager_;

[Peter Beverloo, 2016/09/27 15:57:47]

nit: Document why it's OK to hold a weak reference.

[harkness, 2016/09/28 12:29:20]

Done.

+  bool success_;

[Peter Beverloo, 2016/09/27 15:57:47]

Please initialise scalars with a value.

[harkness, 2016/09/28 12:29:20]

Done.

[Peter Beverloo, 2016/09/28 13:04:26]

Sorry - |budget_manager_|, as a pointer, is also a scalar, and so needs to be
initialized as a nullptr. MSAN will complain about this since it's uninitialised
memory otherwise (i.e. garbage).

[harkness, 2016/09/28 14:34:19]

Done.

+};
+
+IN_PROC_BROWSER_TEST_F(BudgetManagerBrowserTest, BudgetInDocument) {
+  std::string script_result;
+
+  // The page will have been loaded once, which gives a budget of 3.
+  ASSERT_TRUE(RunScript("documentGetBudget()", &script_result));
+  ASSERT_EQ("ok - budget returned value of 3", script_result);
+
+  ASSERT_TRUE(RunScript("documentReserveBudget()", &script_result));
+  ASSERT_EQ("ok - reserved budget", script_result);
+
+  // After reserving budget, the new budget should be at 1.
+  ASSERT_TRUE(RunScript("documentGetBudget()", &script_result));
+  ASSERT_EQ("ok - budget returned value of 1", script_result);
+
+  // A second reserve should fail because there is not enough budget.
+  ASSERT_TRUE(RunScript("documentReserveBudget()", &script_result));
+  ASSERT_EQ("failed - not able to reserve budget", script_result);
+
+  // Consume should succeed because there is an existing reservation.
+  ConsumeReservation();
+  ASSERT_TRUE(success());
+
+  // Second consume should fail because the reservation is consumed.
+  ConsumeReservation();
+  ASSERT_FALSE(success());
+}
+
+IN_PROC_BROWSER_TEST_F(BudgetManagerBrowserTest, BudgetInWorker) {
+  std::string script_result;
+
+  ASSERT_TRUE(RunScript("registerServiceWorker()", &script_result));
+  ASSERT_EQ("ok - service worker registered", script_result);
+
+  LoadTestPage();  // Reload to become controlled.
+
+  ASSERT_TRUE(RunScript("isControlled()", &script_result));
+  ASSERT_EQ("true - is controlled", script_result);
+
+  // The page will have been loaded twice and a service worker was registered,
+  // which gives a budget of 4.5.
+  ASSERT_TRUE(RunScript("workerGetBudget()", &script_result));
+  ASSERT_EQ("ok - budget returned value of 4.5", script_result);
+
+  // With a budget of 4.5, two reservations should succeed.
+  ASSERT_TRUE(RunScript("workerReserveBudget()", &script_result));
+  ASSERT_EQ("ok - reserved budget", script_result);
+
+  ASSERT_TRUE(RunScript("workerReserveBudget()", &script_result));
+  ASSERT_EQ("ok - reserved budget", script_result);
+
+  // After reserving budget, the new budget should be at 0.5.
+  ASSERT_TRUE(RunScript("workerGetBudget()", &script_result));
+  ASSERT_EQ("ok - budget returned value of 0.5", script_result);
+
+  // A second reserve should fail because there is not enough budget.
+  ASSERT_TRUE(RunScript("workerReserveBudget()", &script_result));
+  ASSERT_EQ("failed - not able to reserve budget", script_result);
+
+  // Two consumes should succeed because there are existing reservations.
+  ConsumeReservation();
+  ASSERT_TRUE(success());
+
+  ConsumeReservation();
+  ASSERT_TRUE(success());
+
+  // One more consume should fail, because all reservations are consumed.
+  ConsumeReservation();
+  ASSERT_FALSE(success());
+}