ozone: Implement zero/one-copy texture for Ozone GBM.

ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc

Index: ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
diff --git a/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc b/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
index babdc6767d6b73391733ef3b1407cf020a2a0ba0..1d1d4af239adb38cbf8f80539a67b3f5003af948 100644
--- a/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
+++ b/ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.cc
@@ -75,6 +75,7 @@ class GLImageOzoneNativePixmapDmaBuf : public gfx::GLImageLinuxDMABuffer {
                             gfx::OverlayTransform transform,
                             const gfx::Rect& bounds_rect,
                             const gfx::RectF& crop_rect) override {
+    DCHECK_EQ(pixmap_->GetBufferUsage(), NativePixmap::SCANOUT);
     return OzonePlatform::GetInstance()
         ->GetSurfaceFactoryOzone()
         ->ScheduleOverlayPlane(widget, z_order, transform, pixmap_, bounds_rect,
@@ -141,7 +142,8 @@ GpuMemoryBufferFactoryOzoneNativeBuffer::
     ~GpuMemoryBufferFactoryOzoneNativeBuffer() {
 }
 
-bool GpuMemoryBufferFactoryOzoneNativeBuffer::CreateGpuMemoryBuffer(
+gfx::GpuMemoryBufferHandle
+GpuMemoryBufferFactoryOzoneNativeBuffer::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::GpuMemoryBuffer::Format format,
@@ -156,11 +158,22 @@ bool GpuMemoryBufferFactoryOzoneNativeBuffer::CreateGpuMemoryBuffer(
   if (!pixmap.get()) {
     LOG(ERROR) << "Failed to create pixmap " << size.width() << "x"
                << size.height() << " format " << format << ", usage " << usage;
-    return false;
+    return gfx::GpuMemoryBufferHandle();
   }
+
+  gfx::GpuMemoryBufferHandle handle;
+  handle.type = gfx::OZONE_NATIVE_BUFFER;
+  handle.id = id;
+  if (usage == gfx::GpuMemoryBuffer::MAP) {
+    handle.handle =
+        OzonePlatform::GetInstance()->GetSurfaceFactoryOzone()->ExportDmaBuf(
+            surface_handle, pixmap);
+    DCHECK(handle.handle.fd > 0) << "Fail to export dma_buf.";
+  }
+
   base::AutoLock lock(native_pixmap_map_lock_);
   native_pixmap_map_[GetIndex(id, client_id)] = pixmap;
-  return true;
+  return handle;
 }
 
 void GpuMemoryBufferFactoryOzoneNativeBuffer::DestroyGpuMemoryBuffer(