cc: Make OutputSurface::SwapBuffers pure virtual

mojo/cc/direct_output_surface.cc

+// Copyright 2014 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 "mojo/cc/direct_output_surface.h"
+
+#include "base/bind.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/context_provider.h"
+#include "cc/output/output_surface_client.h"
+#include "gpu/command_buffer/client/context_support.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+
+namespace mojo {
+
+DirectOutputSurface::DirectOutputSurface(
+    const scoped_refptr<cc::ContextProvider>& context_provider)
+    : cc::OutputSurface(context_provider), weak_ptr_factory_(this) {
+}
+
+DirectOutputSurface::~DirectOutputSurface() {}
+
+void DirectOutputSurface::SwapBuffers(cc::CompositorFrame* frame) {
+  DCHECK(context_provider_.get());
+  DCHECK(frame->gl_frame_data);
+  if (frame->gl_frame_data->sub_buffer_rect ==
+      gfx::Rect(frame->gl_frame_data->size)) {
+    context_provider_->ContextSupport()->Swap();
+  } else {
+    context_provider_->ContextSupport()->PartialSwapBuffers(
+        frame->gl_frame_data->sub_buffer_rect);
+  }
+  uint32_t sync_point =
+      context_provider_->ContextGL()->InsertSyncPointCHROMIUM();
+  context_provider_->ContextSupport()->SignalSyncPoint(
+      sync_point,
+      base::Bind(&OutputSurface::OnSwapBuffersComplete,
+                 weak_ptr_factory_.GetWeakPtr()));
+  client_->DidSwapBuffers();
+}
+
+}  // namespace mojo