Mandoline: Add WebGL support

components/html_viewer/web_graphics_context_3d_command_buffer_impl.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 "components/html_viewer/web_graphics_context_3d_command_buffer_impl.h"
+
+#include "components/mus/public/interfaces/gpu.mojom.h"
+#include "mojo/application/public/cpp/application_impl.h"
+#include "mojo/cc/context_provider_mojo.h"
+#include "mojo/gles2/gles2_context.h"
+#include "mojo/gpu/mojo_gles2_impl_autogen.h"
+#include "third_party/mojo/src/mojo/public/cpp/environment/environment.h"
+
+namespace html_viewer {
+
+WebGraphicsContext3DCommandBufferImpl::WebGraphicsContext3DCommandBufferImpl(
+    int surface_id,
+    mojo::ApplicationImpl* app,
+    const GURL& active_url,
+    const blink::WebGraphicsContext3D::Attributes& attributes,
+    blink::WebGraphicsContext3D* shareContext,
+    blink::WebGLInfo* glInfo)
+    : surface_id_(surface_id) {
+  mojo::URLRequestPtr request(mojo::URLRequest::New());
+  request->url = mojo::String::From("mojo:view_manager");

[Fady Samuel, 2015/09/16 00:15:39]

mojo:mus now.

[Peng, 2015/09/16 13:54:59]

Done.

+  mojo::GpuPtr gpu_service;
+  app->ConnectToService(request.Pass(), &gpu_service);
+
+  mojo::CommandBufferPtr cb;
+  gpu_service->CreateOffscreenGLES2Context(GetProxy(&cb));
+  command_buffer_handle_ = cb.PassInterface().PassHandle();
+  CHECK(command_buffer_handle_.is_valid());
+  // TODO(penghuang): Support share context.
+  // TODO(penghuang): Fill glInfo and pass attribuites to GPU.
+  gles2_context_ = MojoGLES2CreateContext(
+      command_buffer_handle_.release().value(),
+      &ContextLostThunk,
+      this,
+      mojo::Environment::GetDefaultAsyncWaiter());
+  context_gl_.reset(new mojo::MojoGLES2Impl(gles2_context_));
+  setGLInterface(context_gl_.get());
+}
+
+WebGraphicsContext3DCommandBufferImpl::
+    ~WebGraphicsContext3DCommandBufferImpl() {
+}
+
+// static
+WebGraphicsContext3DCommandBufferImpl*
+WebGraphicsContext3DCommandBufferImpl::CreateOffscreenContext(
+    mojo::ApplicationImpl* app,
+    const GURL& active_url,
+    const blink::WebGraphicsContext3D::Attributes& attributes,
+    blink::WebGraphicsContext3D* shareContext,
+    blink::WebGLInfo* glInfo) {
+  if (!app)

[sky, 2015/09/15 22:10:58]

Under what circumstances is app null?

[Peng, 2015/09/16 13:54:59]

Done.

+    return nullptr;
+
+  return new WebGraphicsContext3DCommandBufferImpl(
+      0, app, active_url, attributes, shareContext, glInfo);

[sky, 2015/09/15 22:10:58]

I don't see surface_id_ used. Is it needed?

[Peng, 2015/09/16 13:54:59]

It is not useful right now. Removed.

+}
+
+void WebGraphicsContext3DCommandBufferImpl::ContextLost() {
+  if (context_lost_callback_)
+    context_lost_callback_->onContextLost();
+}
+
+}  // namespace html_viewer