Splitting the Mus demo code out of a service.

services/ui/demo/bitmap_uploader.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 "services/ui/demo/bitmap_uploader.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 17 matching lines @@
 
 const char kBitmapUploaderForAcceleratedWidget[] =
     "__BITMAP_UPLOADER_ACCELERATED_WIDGET__";
 
 BitmapUploader::BitmapUploader(Window* window)
     : window_(window),
       color_(g_transparent_color),
       width_(0),
       height_(0),
       format_(BGRA),
-      next_resource_id_(1u) {
-}
+      next_resource_id_(1u),
+      weak_factory_(this) {}
 
 void BitmapUploader::Init(ui::GpuService* gpu_service) {
   surface_ = window_->RequestSurface(mojom::SurfaceType::DEFAULT);
   surface_->BindToThread();
   surface_->set_client(this);
 
-  gles2_context_ = GLES2Context::CreateOffscreenContext(
-      gpu_service->EstablishGpuChannelSync(),
-      base::ThreadTaskRunnerHandle::Get());
+  gpu_service->EstablishGpuChannel(base::Bind(
+      &BitmapUploader::OnGpuChannelEstablished, weak_factory_.GetWeakPtr()));
 }
 
 BitmapUploader::~BitmapUploader() {}
 
 // Sets the color which is RGBA.
 void BitmapUploader::SetColor(uint32_t color) {
   if (color_ == color)
     return;
   color_ = color;
   if (surface_)
@@ skipping 108 matching lines @@
     quad->SetAll(sqs, bounds, opaque_rect, bounds, needs_blending, color_,
                  force_antialiasing_off);
   }
 
   frame.delegated_frame_data->render_pass_list.push_back(std::move(pass));
 
   // TODO(rjkroege, fsamuel): We should throttle frames.
   surface_->SubmitCompositorFrame(std::move(frame), base::Closure());
 }
 
+void BitmapUploader::OnGpuChannelEstablished(
+    scoped_refptr<gpu::GpuChannelHost> gpu_channel) {
+  gles2_context_ = GLES2Context::CreateOffscreenContext(
+      gpu_channel, base::ThreadTaskRunnerHandle::Get());
+}
+
 uint32_t BitmapUploader::BindTextureForSize(const gfx::Size& size) {
   gpu::gles2::GLES2Interface* gl = gles2_context_->interface();
   // TODO(jamesr): Recycle textures.
   GLuint texture = 0u;
   gl->GenTextures(1, &texture);
   gl->BindTexture(GL_TEXTURE_2D, texture);
   gl->TexImage2D(GL_TEXTURE_2D, 0, TextureFormat(), size.width(), size.height(),
                  0, TextureFormat(), GL_UNSIGNED_BYTE, 0);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   return texture;
 }
 
 void BitmapUploader::OnResourcesReturned(
     WindowSurface* surface,
     const cc::ReturnedResourceArray& resources) {
   gpu::gles2::GLES2Interface* gl = gles2_context_->interface();
   // TODO(jamesr): Recycle.
   for (size_t i = 0; i < resources.size(); ++i) {
     cc::ReturnedResource resource = std::move(resources[i]);
     DCHECK_EQ(1, resource.count);
     gl->WaitSyncTokenCHROMIUM(resource.sync_token.GetConstData());
     uint32_t texture_id = resource_to_texture_id_map_[resource.id];
     DCHECK_NE(0u, texture_id);
     resource_to_texture_id_map_.erase(resource.id);
     gl->DeleteTextures(1, &texture_id);
   }
 }
 
 }  // namespace ui