Add a Display and ContextProvider concept to mojom, use to recreate

services/native_viewport/onscreen_context_provider.cc

Index: services/native_viewport/onscreen_context_provider.cc
diff --git a/services/native_viewport/onscreen_context_provider.cc b/services/native_viewport/onscreen_context_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c34ff865c36cc74aba74ba189973f1c2c3a8fc4c
--- /dev/null
+++ b/services/native_viewport/onscreen_context_provider.cc
@@ -0,0 +1,58 @@
+// 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 "services/native_viewport/onscreen_context_provider.h"
+
+#include "services/gles2/command_buffer_driver.h"
+#include "services/gles2/command_buffer_impl.h"
+#include "services/gles2/gpu_state.h"
+
+namespace native_viewport {
+
+OnscreenContextProvider::OnscreenContextProvider(
+    const scoped_refptr<gles2::GpuState>& state)
+    : state_(state), widget_(gfx::kNullAcceleratedWidget), binding_(this) {
+}
+
+OnscreenContextProvider::~OnscreenContextProvider() {
+}
+
+void OnscreenContextProvider::Bind(
+    mojo::InterfaceRequest<mojo::ContextProvider> request) {
+  binding_.Bind(request.Pass());
+}
+
+void OnscreenContextProvider::SetAcceleratedWidget(
+    gfx::AcceleratedWidget widget) {
+  widget_ = widget;
+  if (widget_ != gfx::kNullAcceleratedWidget &&
+      !pending_create_callback_.is_null())
+    CreateAndReturnCommandBuffer();
+}
+
+void OnscreenContextProvider::Create(
+    mojo::ViewportParameterListenerPtr viewport_parameter_listener,
+    const CreateCallback& callback) {
+  if (!pending_create_callback_.is_null())
+    pending_create_callback_.Run(nullptr);
+  pending_listener_ = viewport_parameter_listener.Pass();
+  pending_create_callback_ = callback;
+
+  if (widget_ != gfx::kNullAcceleratedWidget)
+    CreateAndReturnCommandBuffer();
+}
+
+void OnscreenContextProvider::CreateAndReturnCommandBuffer() {
+  mojo::CommandBufferPtr cb;
+  new gles2::CommandBufferImpl(
+      GetProxy(&cb), pending_listener_.Pass(), state_->control_task_runner(),
+      state_->sync_point_manager(),
+      make_scoped_ptr(new gles2::CommandBufferDriver(
+          widget_, state_->share_group(), state_->mailbox_manager(),
+          state_->sync_point_manager())));
+  pending_create_callback_.Run(cb.Pass());
+  pending_create_callback_.reset();
+}
+
+}  // namespace mojo