cc: Set the max frames pending from the thread proxy.

cc/thread_proxy.cc

 // 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 "cc/thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "cc/delay_based_time_source.h"
 #include "cc/draw_quad.h"
@@ skipping 927 matching lines @@
     TRACE_EVENT0("cc", "ThreadProxy::initializeRendererOnImplThread");
     DCHECK(isImplThread());
     DCHECK(m_outputSurfaceBeforeInitializationOnImplThread.get());
     *initializeSucceeded = m_layerTreeHostImpl->initializeRenderer(m_outputSurfaceBeforeInitializationOnImplThread.Pass());
     if (*initializeSucceeded) {
         *capabilities = m_layerTreeHostImpl->rendererCapabilities();
         m_schedulerOnImplThread->setSwapBuffersCompleteSupported(
                 capabilities->usingSwapCompleteCallback);
     }
 
+    int maxFramesPending = FrameRateController::kDefaultMaxFramesPending;
+    if (m_layerTreeHostImpl->outputSurface()->Capabilities().has_parent_compositor)

[jamesr, 2013/01/08 00:18:39]

This line caused crashes on the win_aura bots (and potentially in production) -
if we get a non-null OutputSurface but BindToClient fails, *initializeSucceeded
will be false and m_layerTreeHostImpl->outputSurface() will be NULL, so this
explodes.  See https://code.google.com/p/chromium/issues/detail?id=168691

+        maxFramesPending = 1;
+    m_schedulerOnImplThread->setMaxFramesPending(maxFramesPending);
+
     completion->signal();
 }
 
 void ThreadProxy::layerTreeHostClosedOnImplThread(CompletionEvent* completion)
 {
     TRACE_EVENT0("cc", "ThreadProxy::layerTreeHostClosedOnImplThread");
     DCHECK(isImplThread());
     m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
     m_inputHandlerOnImplThread.reset();
     m_layerTreeHostImpl.reset();
@@ skipping 55 matching lines @@
 }
 
 void ThreadProxy::commitPendingOnImplThreadForTesting(CommitPendingRequest* request)
 {
     DCHECK(isImplThread());
     request->commitPending = m_schedulerOnImplThread->commitPending();
     request->completion.signal();
 }
 
 }  // namespace cc