Fix memory dumping for command buffers with no gr_context_.

content/common/gpu/client/context_provider_command_buffer.cc

 // Copyright (c) 2013 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/client/context_provider_command_buffer.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
@@ skipping 429 matching lines @@
   DCHECK(context_thread_checker_.CalledOnValidThread());
   DCHECK(lost_context_callback_.is_null() ||
          lost_context_callback.is_null());
   lost_context_callback_ = lost_context_callback;
 }
 
 bool ContextProviderCommandBuffer::OnMemoryDump(
     const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* pmd) {
   DCHECK(bind_succeeded_);
-  if (!gr_context_)
-    return false;
 
   base::Optional<base::AutoLock> hold;
   if (support_locking_)
     hold.emplace(context_lock_);
 
   gles2_impl_->OnMemoryDump(args, pmd);
   gles2_helper_->OnMemoryDump(args, pmd);
 
-  context_thread_checker_.DetachFromThread();
-  SkiaGpuTraceMemoryDump trace_memory_dump(
-      pmd, gles2_impl_->ShareGroupTracingGUID());
-  gr_context_->get()->dumpMemoryStatistics(&trace_memory_dump);
-  context_thread_checker_.DetachFromThread();
+  if (gr_context_) {
+    context_thread_checker_.DetachFromThread();
+    SkiaGpuTraceMemoryDump trace_memory_dump(
+        pmd, gles2_impl_->ShareGroupTracingGUID());
+    gr_context_->get()->dumpMemoryStatistics(&trace_memory_dump);
+    context_thread_checker_.DetachFromThread();
+  }
   return true;
 }
 
 }  // namespace content