Add NativePixmapHandle type & interface for exporting them

content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc b/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc
index 7acf59c8e51527215405b8ee7a18c12c2f90160c..40500a604f8a10ed40790cccb67a61348d455023 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.cc
@@ -4,6 +4,7 @@
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h"
 
+#include "ui/ozone/public/client_native_pixmap_factory.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
 
 namespace content {
@@ -12,8 +13,9 @@ GpuMemoryBufferImplOzoneNativePixmap::GpuMemoryBufferImplOzoneNativePixmap(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
-    const DestructionCallback& callback)
-    : GpuMemoryBufferImpl(id, size, format, callback) {}
+    const DestructionCallback& callback,
+    scoped_ptr<ui::ClientNativePixmap> pixmap)
+    : GpuMemoryBufferImpl(id, size, format, callback), pixmap_(pixmap.Pass()) {}
 
 GpuMemoryBufferImplOzoneNativePixmap::~GpuMemoryBufferImplOzoneNativePixmap() {}
 
@@ -25,22 +27,24 @@ GpuMemoryBufferImplOzoneNativePixmap::CreateFromHandle(
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     const DestructionCallback& callback) {
+  scoped_ptr<ui::ClientNativePixmap> native_pixmap =
+      ui::ClientNativePixmapFactory::GetInstance()->ImportFromHandle(
+          handle.native_pixmap_handle, size, format, usage);
   return make_scoped_ptr<GpuMemoryBufferImpl>(
       new GpuMemoryBufferImplOzoneNativePixmap(handle.id, size, format,
-                                               callback));
+                                               callback, native_pixmap.Pass()));
 }
 
 bool GpuMemoryBufferImplOzoneNativePixmap::Map(void** data) {
-  NOTREACHED();
-  return false;
+  return pixmap_->Map(data);
 }
 
 void GpuMemoryBufferImplOzoneNativePixmap::Unmap() {
-  NOTREACHED();
+  pixmap_->Unmap();
 }
 
 void GpuMemoryBufferImplOzoneNativePixmap::GetStride(int* stride) const {
-  NOTREACHED();
+  pixmap_->GetStride(stride);
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplOzoneNativePixmap::GetHandle()