Add test for paint underinvalidation fix with animated transform overflow.

third_party/WebKit/Source/web/tests/sim/SimTest.cpp

 // Copyright 2015 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 "web/tests/sim/SimTest.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "platform/LayoutTestSupport.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/WebCache.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 
 namespace blink {
 
-SimTest::SimTest() : m_webViewClient(m_compositor) {
+SimTest::SimTest() : SimTest(nullptr) {
+}
+
+SimTest::SimTest(void (*updateSettingsFunc)(WebSettings*)) : m_webViewClient(m_compositor) {
   Document::setThreadedParsingEnabledForTesting(false);
   // Use the mock theme to get more predictable code paths, this also avoids
   // the OS callbacks in ScrollAnimatorMac which can schedule frames
   // unpredictably since the OS will randomly call into blink for
   // updateScrollerStyleForNewRecommendedScrollerStyle which then does
   // FrameView::scrollbarStyleChanged and will adjust the scrollbar existence
   // in the middle of a test.
   LayoutTestSupport::setMockThemeEnabledForTest(true);
   ScrollbarTheme::setMockScrollbarsEnabled(true);
-  m_webViewHelper.initialize(true, nullptr, &m_webViewClient);
+  m_webViewHelper.initialize(true, nullptr, &m_webViewClient, nullptr, updateSettingsFunc);
   m_compositor.setWebViewImpl(webView());
   m_page.setPage(webView().page());
 }
 
 SimTest::~SimTest() {
   // Pump the message loop to process the load event.
   testing::runPendingTasks();
 
   Document::setThreadedParsingEnabledForTesting(true);
   LayoutTestSupport::setMockThemeEnabledForTest(false);
@@ skipping 28 matching lines @@
 
 const SimWebViewClient& SimTest::webViewClient() const {
   return m_webViewClient;
 }
 
 SimCompositor& SimTest::compositor() {
   return m_compositor;
 }
 
 }  // namespace blink