gpu: Fix some context lost marking glitches+leaks and add UMA stats

content/renderer/pepper/pepper_video_encoder_host.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 "base/bind.h"
 #include "base/memory/shared_memory.h"
 #include "base/numerics/safe_math.h"
 #include "content/common/gpu/client/command_buffer_proxy_impl.h"
 #include "content/common/gpu/media/gpu_video_accelerator_util.h"
 #include "content/common/pepper_file_util.h"
@@ skipping 495 matching lines @@
 
   std::vector<int32> attribs(1, PP_GRAPHICS3DATTRIB_NONE);
   command_buffer_ = channel_->CreateOffscreenCommandBuffer(
       gfx::Size(), nullptr, attribs, GURL::EmptyGURL(),
       gfx::PreferIntegratedGpu);
   if (!command_buffer_) {
     Close();
     return false;
   }
 
-  command_buffer_->SetChannelErrorCallback(media::BindToCurrentLoop(
+  command_buffer_->SetContextLostCallback(media::BindToCurrentLoop(
       base::Bind(&PepperVideoEncoderHost::NotifyPepperError,
                  weak_ptr_factory_.GetWeakPtr(), PP_ERROR_RESOURCE_FAILED)));
   if (!command_buffer_->Initialize()) {
     Close();
     return false;
   }
 
   return true;
 }
 
@@ skipping 138 matching lines @@
 }
 
 uint8_t* PepperVideoEncoderHost::ShmHandleToAddress(int32 buffer_id) {
   DCHECK(RenderThreadImpl::current());
   DCHECK_GE(buffer_id, 0);
   DCHECK_LT(buffer_id, static_cast<int32>(shm_buffers_.size()));
   return static_cast<uint8_t*>(shm_buffers_[buffer_id]->shm->memory());
 }
 
 }  // namespace content