[Ozone-DRI] Adding ScanoutBuffer interface

ui/ozone/platform/dri/dri_buffer.cc

Index: ui/ozone/platform/dri/dri_buffer.cc
diff --git a/ui/ozone/platform/dri/dri_buffer.cc b/ui/ozone/platform/dri/dri_buffer.cc
index 6fab6863b188c6da81f6d291078dbb4fead8dade..4a35395c95a42a9cd50169c682448d5738de1156 100644
--- a/ui/ozone/platform/dri/dri_buffer.cc
+++ b/ui/ozone/platform/dri/dri_buffer.cc
@@ -79,4 +79,33 @@ bool DriBuffer::Initialize(const SkImageInfo& info) {
   return true;
 }
 
+SkCanvas* DriBuffer::GetCanvas() const {
+  return surface_->getCanvas();
+}
+
+uint32_t DriBuffer::GetFramebufferId() const {
+  return framebuffer_;
+}
+
+uint32_t DriBuffer::GetHandle() const {
+  return handle_;
+}
+
+gfx::Size DriBuffer::GetSize() const {
+  return gfx::Size(surface_->width(), surface_->height());
+}
+
+DriBufferGenerator::DriBufferGenerator(DriWrapper* dri) : dri_(dri) {}
+
+DriBufferGenerator::~DriBufferGenerator() {}
+
+scoped_refptr<ScanoutBuffer> DriBufferGenerator::Create(const gfx::Size& size) {
+  scoped_refptr<DriBuffer> buffer(new DriBuffer(dri_));
+  SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
+  if (!buffer->Initialize(info))
+    return NULL;
+
+  return buffer;
+}
+
 }  // namespace ui