Provide task runner to GLES2Impl / CommandBuffer at creation

gpu/ipc/client/command_buffer_proxy_impl.cc

Index: gpu/ipc/client/command_buffer_proxy_impl.cc
diff --git a/gpu/ipc/client/command_buffer_proxy_impl.cc b/gpu/ipc/client/command_buffer_proxy_impl.cc
index 395dcddc18eb5425b6ee37362d6e7e1906ce4bb8..a8a952d455b0eb388d2ca55344b8bde9964ce8db 100644
--- a/gpu/ipc/client/command_buffer_proxy_impl.cc
+++ b/gpu/ipc/client/command_buffer_proxy_impl.cc
@@ -61,8 +61,7 @@ CommandBufferProxyImpl::CommandBufferProxyImpl(int channel_id,
       flushed_fence_sync_release_(0),
       verified_fence_sync_release_(0),
       next_signal_id_(0),
-      weak_this_(AsWeakPtr()),
-      callback_thread_(base::ThreadTaskRunnerHandle::Get()) {
+      weak_this_(AsWeakPtr()) {
   DCHECK(route_id);
   DCHECK_NE(stream_id, GPU_STREAM_INVALID);
 }
@@ -218,8 +217,7 @@ bool CommandBufferProxyImpl::Initialize(
 
   // Route must be added before sending the message, otherwise messages sent
   // from the GPU process could race against adding ourselves to the filter.
-  channel->AddRouteWithTaskRunner(route_id_, AsWeakPtr(),
-                                  std::move(task_runner));
+  channel->AddRouteWithTaskRunner(route_id_, AsWeakPtr(), task_runner);
 
   // We're blocking the UI thread, which is generally undesirable.
   // In this case we need to wait for this before we can show any UI /anyway/,
@@ -237,6 +235,8 @@ bool CommandBufferProxyImpl::Initialize(
   channel_ = std::move(channel);
   capabilities_.image = true;
 
+  callback_thread_ = std::move(task_runner);
+
   return true;
 }