Change glimage to accept a type.

content/common/gpu/client/gpu_memory_buffer_impl_linux.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_linux.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_linux.cc b/content/common/gpu/client/gpu_memory_buffer_impl_linux.cc
index ffd4e381c7d9276e27d51e5c9d027ecca96dd33c..0f1f9156fb2be79ea700f883a3b0526e6d6fa11d 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_linux.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_linux.cc
@@ -11,7 +11,11 @@ namespace content {
 scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImpl::Create(
     gfx::GpuMemoryBufferHandle handle,
     gfx::Size size,
-    unsigned internalformat) {
+    unsigned internalformat,
+    gfx::GpuMemoryBuffer::Usage usage) {
+  if (usage == gfx::GpuMemoryBuffer::SCANOUT)
+    return scoped_ptr<GpuMemoryBufferImpl>();
+
   switch (handle.type) {
     case gfx::SHARED_MEMORY_BUFFER: {
       scoped_ptr<GpuMemoryBufferImplShm> buffer(