Disable scrollbars on the root scroller when using visual viewport scrollbars.

ppapi/tests/test_graphics_2d.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 "ppapi/tests/test_graphics_2d.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include <set>
@@ skipping 667 matching lines @@
   // Squeeze from top until bottom half of plugin is out of screen.
   ResetViewChangedState();
   instance_->EvalScript(
       "var big = document.createElement('div');"
       "var offset = "
       "    window.innerHeight - plugin.offsetTop - plugin.offsetHeight / 2;"
       "big.setAttribute('id', 'big-div');"
       "big.setAttribute('style', 'height: ' + offset + '; width: 100%;');"
       "document.body.insertBefore(big, document.body.firstChild);");
   ASSERT_TRUE(WaitUntilViewChanged());
+  ASSERT_SUBTEST_SUCCESS(FlushAndWaitForDone(&dc));
 
   // Allocate a red image chunk
   pp::ImageData chunk(instance_, PP_IMAGEDATAFORMAT_RGBA_PREMUL,
                       pp::Size(w/8, h/8), true);
   ASSERT_FALSE(chunk.is_null());
   const uint32_t kRed = 0xff0000ff;
   FillRectInImage(&chunk, pp::Rect(chunk.size()), kRed);
 
   // Paint a invisable chunk, expecting Flush to invoke callback slowly.
   dc.PaintImageData(chunk, pp::Point(0, h*0.75));
@@ skipping 98 matching lines @@
   pp::Graphics2D dc(instance_, pp::Size(w, h), false);
   ASSERT_FALSE(dc.is_null());
   ASSERT_TRUE(instance_->BindGraphics(dc));
 
   ASSERT_TRUE(instance_->BindGraphics(pp::Graphics2D()));
   ASSERT_TRUE(instance_->BindGraphics(pp::Graphics3D()));
 
   PASS();
 }