Add initial GpuMemoryBufferSurfaceTexture implementation.

ui/gfx/gpu_memory_buffer.h

Index: ui/gfx/gpu_memory_buffer.h
diff --git a/ui/gfx/gpu_memory_buffer.h b/ui/gfx/gpu_memory_buffer.h
index 3510a911c0493ca3c4781120a3abd0976f78781f..0ceae68866184e1ac5e6853dde791119b650fa78 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -20,7 +20,8 @@ enum GpuMemoryBufferType {
   SHARED_MEMORY_BUFFER,
   EGL_CLIENT_BUFFER,
   IO_SURFACE_BUFFER,
-  GPU_MEMORY_BUFFER_TYPE_LAST = IO_SURFACE_BUFFER
+  SURFACE_TEXTURE_BUFFER,
+  GPU_MEMORY_BUFFER_TYPE_LAST = SURFACE_TEXTURE_BUFFER
 };
 
 struct GpuMemoryBufferHandle {
@@ -33,6 +34,9 @@ struct GpuMemoryBufferHandle {
 #if defined(OS_MACOSX)
         , io_surface_id(0)
 #endif
+#if defined(OS_ANDROID)
+        , surface_texture_id(0)
+#endif
   {
   }
   bool is_null() const { return type == EMPTY_BUFFER; }
@@ -44,7 +48,9 @@ struct GpuMemoryBufferHandle {
 #if defined(OS_MACOSX)
   uint32 io_surface_id;
 #endif
-
+#if defined(OS_ANDROID)
+  uint32 surface_texture_id;

[epennerAtGoogle, 2014/03/12 00:45:06]

Throughout this patch, I'd like it if we can make it very clear that these ID's
come from a certain 'name-space' of SurfaceTextures. They will have more and
more uses of SurfaceTexture, and not all of them have an ID from this source of
IDs and you can't find the source of 'int' as easily in code-search. Possibly
longer names like name_space_surface_texture_id, or even a real type with
::GetID(), might help?

[reveman, 2014/03/12 16:07:06]

Would a simple typedef int SurfaceTextureID help?

[epennerAtGoogle, 2014/03/12 19:46:28]

Yeppers!

[reveman, 2014/03/13 21:36:00]

I started doing this but realized I need to put it in a separate file to do it
properly. ui/gfx/android/surface_texture_id.h or something like that. Not sure
that's worth it. At least I made it consistently "int" in latest patch but I
don't think that addresses your concern. I think "int" is fine but I'll go ahead
and add a new file for this if you feel strongly about it. Let me know.

+#endif
 };
 
 // Interface for creating and accessing a zero-copy GPU memory buffer.