cc: Avoid unnecessary destruction of texture update controller.

cc/CCThreadProxy.cpp

 // Copyright 2011 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 "config.h"
 
 #include "CCThreadProxy.h"
 
 #include "CCDelayBasedTimeSource.h"
 #include "CCDrawQuad.h"
@@ skipping 288 matching lines @@
     if (m_commitRequestSentToImplThread)
         return;
     m_commitRequestSentToImplThread = true;
     CCProxy::implThread()->postTask(createCCThreadTask(this, &CCThreadProxy::setNeedsCommitOnImplThread));
 }
 
 void CCThreadProxy::didLoseContextOnImplThread()
 {
     ASSERT(isImplThread());
     TRACE_EVENT0("cc", "CCThreadProxy::didLoseContextOnImplThread");
-    m_currentTextureUpdateControllerOnImplThread.clear();
     m_schedulerOnImplThread->didLoseContext();
 }
 
 void CCThreadProxy::onSwapBuffersCompleteOnImplThread()
 {
     ASSERT(isImplThread());
     TRACE_EVENT0("cc", "CCThreadProxy::onSwapBuffersCompleteOnImplThread");
     m_schedulerOnImplThread->didSwapBuffersComplete();
     m_mainThreadProxy->postTask(createCCThreadTask(this, &CCThreadProxy::didCompleteSwapBuffers));
 }
@@ skipping 591 matching lines @@
 }
 
 void CCThreadProxy::implSideRenderingStatsOnImplThread(CCCompletionEvent* completion, CCRenderingStats* stats)
 {
     ASSERT(isImplThread());
     m_layerTreeHostImpl->renderingStats(*stats);
     completion->signal();
 }
 
 } // namespace WebCore