Add missing null check to AVDA deferred rendering shutdown path.

content/common/gpu/media/android_deferred_rendering_backing_strategy.cc

 // Copyright 2015 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/common/gpu/media/android_deferred_rendering_backing_strategy.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 23 matching lines @@
   // so that it gets attached in the compositor gl context in the common case.
   GLuint service_id = 0;
   glGenTextures(1, &service_id);
   DCHECK(service_id);
   shared_state_->set_surface_texture_service_id(service_id);
 }
 
 void AndroidDeferredRenderingBackingStrategy::Cleanup(
     bool have_context,
     const AndroidVideoDecodeAccelerator::OutputBufferMap& buffers) {
+  // If we failed before Initialize, then do nothing.
+  if (!shared_state_)
+    return;
+
   // Make sure that no PictureBuffer textures refer to the SurfaceTexture or to
   // the service_id that we created for it.
   for (const std::pair<int, media::PictureBuffer>& entry : buffers)
     SetImageForPicture(entry.second, nullptr);
 
   // Now that no AVDACodecImages refer to the SurfaceTexture's texture, delete
   // the texture name.
   GLuint service_id = shared_state_->surface_texture_service_id();
   if (service_id > 0 && have_context)
     glDeleteTextures(1, &service_id);
@@ skipping 146 matching lines @@
     avImage->SetMediaCodec(codec);
     avImage->SetMediaCodecBufferIndex(-1);
   }
 }
 
 void AndroidDeferredRenderingBackingStrategy::OnFrameAvailable() {
   shared_state_->SignalFrameAvailable();
 }
 
 }  // namespace content