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

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..0279fd22ad5352cef9efd3bbe715213328b6b61c 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
@@ -4,7 +4,7 @@
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h"
 
-#include "ui/ozone/public/surface_factory_ozone.h"
+#include "ui/ozone/public/client_native_pixmap_factory.h"
 
 namespace content {
 
@@ -12,8 +12,9 @@ GpuMemoryBufferImplOzoneNativePixmap::GpuMemoryBufferImplOzoneNativePixmap(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
+    gfx::BufferUsage usage,
     const DestructionCallback& callback)
-    : GpuMemoryBufferImpl(id, size, format, callback) {}
+    : GpuMemoryBufferImpl(id, size, format, callback), usage_(usage) {}
 
 GpuMemoryBufferImplOzoneNativePixmap::~GpuMemoryBufferImplOzoneNativePixmap() {}
 
@@ -25,22 +26,54 @@ GpuMemoryBufferImplOzoneNativePixmap::CreateFromHandle(
     gfx::BufferFormat format,
     gfx::BufferUsage usage,
     const DestructionCallback& callback) {
-  return make_scoped_ptr<GpuMemoryBufferImpl>(
-      new GpuMemoryBufferImplOzoneNativePixmap(handle.id, size, format,
-                                               callback));
+  scoped_ptr<GpuMemoryBufferImplOzoneNativePixmap> buffer =
+      make_scoped_ptr(new GpuMemoryBufferImplOzoneNativePixmap(
+          handle.id, size, format, usage, callback));
+
+  if (!buffer->Initialize(handle))
+    return nullptr;
+  return buffer.Pass();
 }
 
-bool GpuMemoryBufferImplOzoneNativePixmap::Map(void** data) {
+bool GpuMemoryBufferImplOzoneNativePixmap::Initialize(
+    const gfx::GpuMemoryBufferHandle& handle) {
+  DCHECK(ui::ClientNativePixmapFactory::GetInstance());
+  switch (usage_) {
+    case gfx::BufferUsage::MAP:
+      pixmap_ = ui::ClientNativePixmapFactory::GetInstance()
+                    ->ImportNativePixmap(handle.handle, size_, format_, usage_)
+                    .Pass();
+      return !!pixmap_;
+    case gfx::BufferUsage::PERSISTENT_MAP:
+      NOTREACHED();
+      return false;
+    case gfx::BufferUsage::SCANOUT:
+      return true;
+  }
   NOTREACHED();
   return false;
 }
 
+bool GpuMemoryBufferImplOzoneNativePixmap::Map(void** data) {
+  DCHECK(!mapped_);
+  DCHECK(usage_ == gfx::BufferUsage::MAP);
+  DCHECK(pixmap_);
+  mapped_ = true;
+  return pixmap_->Map(data);
+}
+
 void GpuMemoryBufferImplOzoneNativePixmap::Unmap() {
-  NOTREACHED();
+  DCHECK(mapped_);
+  DCHECK(usage_ == gfx::BufferUsage::MAP);
+  DCHECK(pixmap_);
+  pixmap_->Unmap();
+  mapped_ = false;
 }
 
 void GpuMemoryBufferImplOzoneNativePixmap::GetStride(int* stride) const {
-  NOTREACHED();
+  DCHECK(usage_ == gfx::BufferUsage::MAP);
+  DCHECK(pixmap_);
+  pixmap_->GetStride(stride);
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplOzoneNativePixmap::GetHandle()