Add test plumbing so that layout tests can query whether a compositor frame was requested

content/shell/renderer/test_runner/WebTestProxy.cpp

 // Copyright 2013 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/shell/renderer/test_runner/WebTestProxy.h"
 
 #include <cctype>
 
 #include "content/shell/renderer/test_runner/AccessibilityController.h"
 #include "content/shell/renderer/test_runner/EventSender.h"
@@ skipping 720 matching lines @@
 
 void WebTestProxyBase::animateNow()
 {
     if (m_animateScheduled) {
         m_animateScheduled = false;
         webWidget()->animate(0.0);
         webWidget()->layout();
     }
 }
 
+bool WebTestProxyBase::isCompositorFramePending() const
+{
+    return m_animateScheduled || !m_paintRect.isEmpty();
+}
+
 void WebTestProxyBase::show(WebNavigationPolicy)
 {
     invalidateAll();
 }
 
 void WebTestProxyBase::setWindowRect(const WebRect& rect)
 {
     invalidateAll();
     discardBackingStore();
 }
@@ skipping 596 matching lines @@
 
 void WebTestProxyBase::resetInputMethod()
 {
     // If a composition text exists, then we need to let the browser process
     // to cancel the input method's ongoing composition session.
     if (m_webWidget)
         m_webWidget->confirmComposition();
 }
 
 }