Thread ui transform animations

content/browser/web_contents/web_contents_view_aura_browsertest.cc

 // Copyright (c) 2012 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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
 #include "base/test/test_timeouts.h"
 #include "base/utf_string_conversions.h"
@@ skipping 206 matching lines @@
   EXPECT_EQ(1, GetCurrentIndex());
   ExecuteSyncJSFunction(view_host, "navigate_next()");
   EXPECT_EQ(2, GetCurrentIndex());
   web_contents->GetController().GoBack();
   EXPECT_EQ(1, GetCurrentIndex());
 
   aura::Window* content = web_contents->GetView()->GetContentNativeView();
   aura::RootWindow* root_window = content->GetRootWindow();
   gfx::Rect bounds = content->GetBoundsInRootWindow();
 
+
+  // Each call to GetCurrentIndex involves blocking until the current
+  // MessageLoop is idle. Without a delay in scheduling draws, the
+  // MessageLoop doesn't become idle until the animation triggered by the
+  // preceding touch event completes; since each such animation takes 200ms,
+  // this causes the test to timeout.
+  root_window->DelayDrawsForTesting(base::TimeDelta::FromMilliseconds(10));

[Ian Vollick, 2013/03/04 13:50:50]

SetDrawDelayForTesting, perhaps? DelayDrawsForTesting sounds like it wants a
boolean parameter, if any; passing a time delta reads a little funny.

+
   base::TimeDelta timestamp;
   ui::TouchEvent press(ui::ET_TOUCH_PRESSED,
       gfx::Point(bounds.x() + bounds.width() / 2, bounds.y() + 5),
       0, timestamp);
   root_window->AsRootWindowHostDelegate()->OnHostTouchEvent(&press);
   EXPECT_EQ(1, GetCurrentIndex());
 
   timestamp += base::TimeDelta::FromMilliseconds(10);
   ui::TouchEvent move1(ui::ET_TOUCH_MOVED,
       gfx::Point(bounds.right() - 10, bounds.y() + 5),
@@ skipping 172 matching lines @@
         web_contents->GetController().GetEntryAtOffset(-1));
     EXPECT_TRUE(entry->screenshot().get());
 
     entry = NavigationEntryImpl::FromNavigationEntry(
         web_contents->GetController().GetActiveEntry());
     EXPECT_FALSE(entry->screenshot().get());
   }
 }
 
 }  // namespace content