cc: Route offscreen context creation for compositor to the browser.

content/common/gpu/client/offscreen_context_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/offscreen_context_command_buffer.h"
+
+namespace content {
+
+OffscreenContextCommandBuffer::OffscreenContextCommandBuffer(
+    OffscreenContextCommandBufferClient* client)
+    : client_(client) {
+}
+
+OffscreenContextCommandBuffer::~OffscreenContextCommandBuffer() {
+  if (context3d_) {
+    context3d_->setContextLostCallback(NULL);
+    context3d_->setMemoryAllocationChangedCallbackCHROMIUM(NULL);
+  }
+}
+
+WebGraphicsContext3DCommandBufferImpl* OffscreenContextCommandBuffer::
+    Context3d() {
+  if (context3d_)
+    return context3d_.get();
+
+  context3d_.reset(client_->CreateOffscreenContext());
+  if (context3d_ &&
+      (!context3d_->makeContextCurrent() ||
+       context3d_->getGraphicsResetStatusARB()))
+    context3d_.reset();
+
+  client_->DidCreateContext(this, !!context3d_);
+  if (!context3d_)
+    return NULL;
+
+  context3d_->setContextLostCallback(this);
+  // TODO(danakj): Talk to the GPU mem manager directly.
+  context3d_->setMemoryAllocationChangedCallbackCHROMIUM(this);
+  return context3d_.get();
+}
+
+void OffscreenContextCommandBuffer::onContextLost() {
+  // Save the context3d until the notifications are done, but requests for a
+  // context should create a new one.
+  scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d =
+      context3d_.Pass();
+  if (context3d)
+    context3d->setMemoryAllocationChangedCallbackCHROMIUM(NULL);
+
+  // Inform the superclass.
+  DidLoseContext();
+
+  client_->DidLoseContext(this);
+}
+
+// WebGraphicsMemoryAllocationChangedCallbackCHROMIUM implementation.
+void OffscreenContextCommandBuffer::onMemoryAllocationChanged(
+    WebKit::WebGraphicsMemoryAllocation allocation) {
+  SetGaneshContextMemoryLimit(!!allocation.gpuResourceSizeInBytes);
+}
+
+}  // namespace content