Modify a test to wait for compositor frame of OOPIF synced with CSS modifications in parent process

chrome/browser/site_per_process_interactive_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/strings/string_number_conversions.h"
 #include "base/test/scoped_feature_list.h"
+#include "base/test/test_timeouts.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu_browsertest_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/exclusive_access/fullscreen_controller_test.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/interactive_test_utils.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/autofill/core/browser/autofill_client.h"
 #include "components/autofill/core/browser/test_autofill_client.h"
 #include "components/guest_view/browser/guest_view_manager_delegate.h"
 #include "components/guest_view/browser/test_guest_view_manager.h"
 #include "components/security_state/core/security_state.h"
+#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/focused_node_details.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 1203 matching lines @@
 
  private:
   content::NotificationRegistrar registrar_;
   bool observed_;
   gfx::Point focused_node_bounds_in_screen_;
   scoped_refptr<content::MessageLoopRunner> loop_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusedEditableNodeChangedObserver);
 };
 
+// Waits until transforming |sample_point| from |render_frame_host| coordinates
+// to its root frame's view's coordinates matches |transformed_point| within a
+// reasonable error margin less than or equal to |bound|. This method is used to
+// verify CSS changes on OOPIFs have been applied properly and the corresponding
+// compositor frame is updated as well. This way we can rest assured that the
+// future transformed and reported bounds for the elements inside
+// |render_frame_host| are correct.
+void WaitForFramePositionUpdated(content::RenderFrameHost* render_frame_host,
+                                 const gfx::Point& sample_point,
+                                 const gfx::Point& transformed_point,
+                                 float bound) {
+  while ((transformed_point -
+          render_frame_host->GetView()->TransformPointToRootCoordSpace(
+              sample_point))
+             .Length() > bound) {
+    base::RunLoop run_loop;
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+        FROM_HERE, run_loop.QuitClosure(), TestTimeouts::tiny_timeout());
+    run_loop.Run();
+  }
+}
 // This test verifies that displacements (margin, etc) in the position of an
 // OOPIF is considered when showing an AutofillClient warning pop-up for
 // unsecure web sites.
-// Test is flaky. crbug.com/705914
 IN_PROC_BROWSER_TEST_F(SitePerProcessAutofillTest,
-                       DISABLED_PasswordAutofillPopupPositionInsideOOPIF) {
+                       PasswordAutofillPopupPositionInsideOOPIF) {
   SetupMainTab();
   ASSERT_TRUE(
       base::FeatureList::IsEnabled(security_state::kHttpFormWarningFeature));
 
   GURL main_url(embedded_test_server()->GetURL("a.com", "/iframe.html"));
   ui_test_utils::NavigateToURL(browser(), main_url);
   content::WebContents* active_web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   // Add some displacement for <iframe>.
   ASSERT_TRUE(content::ExecuteScript(
       active_web_contents,
       base::StringPrintf("var iframe = document.querySelector('iframe');"
-                         "iframe.style.marginTop = '%dpx';"
-                         "iframe.style.marginLeft = '%dpx';",
+                         "iframe.style.position = 'fixed';"
+                         "iframe.style.border = 'none';"
+                         "iframe.style.top = '%dpx';"
+                         "iframe.style.left = '%dpx';",
                          kIframeTopDisplacement, kIframeLeftDisplacement)));
 
   // Navigate the <iframe> to a simple page.
   GURL frame_url = embedded_test_server()->GetURL("b.com", "/title1.html");
   EXPECT_TRUE(NavigateIframeToURL(active_web_contents, "test", frame_url));
   content::RenderFrameHost* child_frame = content::FrameMatchingPredicate(
       active_web_contents, base::Bind(&content::FrameIsChildOfMainFrame));
 
+  WaitForFramePositionUpdated(
+      child_frame, gfx::Point(),
+      gfx::Point(kIframeLeftDisplacement, kIframeTopDisplacement), 1.4143f);
+
   // We will need to listen to focus changes to find out about the container
   // bounds of any focused <input> elements on the page.
   FocusedEditableNodeChangedObserver focus_observer;
 
   // Focus the child frame, add an <input> with type "password", and focus it.
   ASSERT_TRUE(ExecuteScript(child_frame,
                             "window.focus();"
                             "var input = document.createElement('input');"
                             "input.type = 'password';"
                             "document.body.appendChild(input);"
@@ skipping 21 matching lines @@
 
   // Ideally, the length of the error vector should be 0.0f. But due to
   // potential rounding errors, we assume a larger limit (which is slightly
   // larger than square root of 2).
   EXPECT_LT(error.Length(), 1.4143f)
       << "Origin of bounds from focused node changed event is '"
       << focus_observer.focused_node_bounds_in_screen().ToString()
       << "' but AutofillClient is reporting '" << bounds_origin.ToString()
       << "'";
 }