Provide task runner to GLES2Impl / CommandBuffer at creation

gpu/command_buffer/client/gl_in_process_context.cc

Index: gpu/command_buffer/client/gl_in_process_context.cc
diff --git a/gpu/command_buffer/client/gl_in_process_context.cc b/gpu/command_buffer/client/gl_in_process_context.cc
index c87f23396c7d7d5096f012fd9d4962715d78ac8d..b70f57b6c43ac1f428978f00ae441d92c622ff3a 100644
--- a/gpu/command_buffer/client/gl_in_process_context.cc
+++ b/gpu/command_buffer/client/gl_in_process_context.cc
@@ -26,6 +26,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "gpu/command_buffer/client/gles2_cmd_helper.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/client/shared_memory_limits.h"
@@ -103,6 +104,15 @@ bool GLInProcessContextImpl::Initialize(
   DCHECK_GE(attribs.offscreen_framebuffer_size.width(), 0);
   DCHECK_GE(attribs.offscreen_framebuffer_size.height(), 0);
 
+  // Setup the task runner which will be used by both the CommandBuffer and
+  // GLES2Implementation.
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner;
+  // If a surface is provided, we are running in a webview and do not have a
+  // task runner.
+  if (!surface) {
+    task_runner = base::ThreadTaskRunnerHandle::Get();
+  }
+
   command_buffer_.reset(new InProcessCommandBuffer(service));
 
   scoped_refptr<gles2::ShareGroup> share_group;
@@ -116,13 +126,9 @@ bool GLInProcessContextImpl::Initialize(
     DCHECK(share_command_buffer);
   }
 
-  if (!command_buffer_->Initialize(surface,
-                                   is_offscreen,
-                                   window,
-                                   attribs,
-                                   share_command_buffer,
-                                   gpu_memory_buffer_manager,
-                                   image_factory)) {
+  if (!command_buffer_->Initialize(
+          surface, is_offscreen, window, attribs, share_command_buffer,
+          gpu_memory_buffer_manager, image_factory, task_runner)) {
     DLOG(ERROR) << "Failed to initialize InProcessCommmandBuffer";
     return false;
   }
@@ -144,14 +150,11 @@ bool GLInProcessContextImpl::Initialize(
   const bool support_client_side_arrays = false;
 
   // Create the object exposing the OpenGL API.
-  gles2_implementation_.reset(
-      new gles2::GLES2Implementation(gles2_helper_.get(),
-                                     share_group.get(),
-                                     transfer_buffer_.get(),
-                                     bind_generates_resource,
-                                     attribs.lose_context_when_out_of_memory,
-                                     support_client_side_arrays,
-                                     command_buffer_.get()));
+  gles2_implementation_.reset(new gles2::GLES2Implementation(
+      gles2_helper_.get(), share_group.get(), transfer_buffer_.get(),
+      bind_generates_resource, attribs.lose_context_when_out_of_memory,
+      support_client_side_arrays, command_buffer_.get(),
+      std::move(task_runner)));
 
   if (!gles2_implementation_->Initialize(
           mem_limits.start_transfer_buffer_size,