Generalizing architecture for screenshot testing

chrome/browser/chromeos/login/screenshot_comparing_admixture.cc

+// Copyright 2014 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 "chrome/browser/chromeos/login/screenshot_comparing_admixture.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "ui/compositor/compositor_switches.h"
+
+namespace chromeos {
+
+ScreenshotComparingAdmixture::ScreenshotComparingAdmixture() : registrar_() {

[dzhioev (left Google), 2014/08/25 17:01:19]

No need for |registrar_| explicit initialization.

[Lisa Ignatyeva, 2014/08/25 17:57:54]

Done.

+}
+
+ScreenshotComparingAdmixture::~ScreenshotComparingAdmixture() {
+}
+
+void ScreenshotComparingAdmixture::SetUpInProcessBrowserTestFixture() {
+  enable_test_screenshots_ = screenshot_tester_.TryInitialize();
+}
+
+void ScreenshotComparingAdmixture::SetUpCommandLine(
+    base::CommandLine* command_line) {
+  if (enable_test_screenshots_) {
+    command_line->AppendSwitch(switches::kEnablePixelOutputInTests);
+    command_line->AppendSwitch(switches::kUIEnableImplSidePainting);
+  }
+}
+
+void ScreenshotComparingAdmixture::SetUpOnMainThread() {
+  if (enable_test_screenshots_) {
+    InitializeAnimationHandler();
+  }
+}
+
+void ScreenshotComparingAdmixture::WaitUntilAnimationLoads() {
+  if (!IsAnimationLoaded()) {
+    base::RunLoop animation_waiter;
+    PrepareForAnimationWaiting(animation_waiter.QuitClosure());
+    animation_waiter.Run();
+  }
+  SynchronizeAnimationLoadWithCompositor();
+}
+
+void ScreenshotComparingAdmixture::RunScreenshotTesting(
+    const std::string& test_name) {
+  if (enable_test_screenshots_) {
+    WaitUntilAnimationLoads();
+    screenshot_tester_.Run(test_name);
+  }
+}
+
+void ScreenshotComparingAdmixture::PrepareForAnimationWaiting(
+    const base::Closure& quitter) {
+  waiter_loop_is_on_ = true;
+  animation_waiter_quitter_ = quitter;
+}
+
+// Current implementation is a mockup.
+// It simply waits for 5 seconds, assuming that this time is enough for
+// animation to load completely.
+// TODO(elizavetai): Replace this temporary hack with getting a
+// valid notification from compositor.
+void ScreenshotComparingAdmixture::SynchronizeAnimationLoadWithCompositor() {
+  base::RunLoop waiter;
+  animation_waiter_quitter_ = waiter.QuitClosure();
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromSeconds(5),
+               this,
+               &ScreenshotComparingAdmixture::HandleAnimationLoad);
+  waiter.Run();
+}
+
+void ScreenshotComparingAdmixture::HandleAnimationLoad() {
+  timer_.Stop();
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE, animation_waiter_quitter_);
+}
+
+}  // namespace chromeos