Add support for importing AHardwareBuffers into SkSurfaces.

Bug: skia:
Change-Id: I0a3b3d607e1b74787480b03520a07839c87486dc
Reviewed-on: https://skia-review.googlesource.com/c/189980
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index 098ea7e..f5e691c 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -57,6 +57,8 @@
   "$_src/gpu/GrBackendTextureImageGenerator.h",
   "$_src/gpu/GrAHardwareBufferImageGenerator.cpp",
   "$_src/gpu/GrAHardwareBufferImageGenerator.h",
+  "$_src/gpu/GrAHardwareBufferUtils.cpp",
+  "$_src/gpu/GrAHardwareBufferUtils.h",
   "$_src/gpu/GrBaseContextPriv.h",
   "$_src/gpu/GrBitmapTextureMaker.cpp",
   "$_src/gpu/GrBitmapTextureMaker.h",