Enable SurfaceTexture based zero-copy texture uploading on Android platform

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..d2f551aef2a0ea772acf84f4b8aff0d88556594c 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 {
@@ -28,10 +29,14 @@ struct GpuMemoryBufferHandle {
       : type(EMPTY_BUFFER),
         handle(base::SharedMemory::NULLHandle())
 #if defined(OS_ANDROID)
-        , native_buffer(NULL)
+        ,
+        native_buffer(NULL),
+        texture_id(0),
+        surface_texture_handle(NULL)
 #endif
 #if defined(OS_MACOSX)
-        , io_surface_id(0)
+        ,
+        io_surface_id(0)
 #endif
   {
   }
@@ -40,6 +45,8 @@ struct GpuMemoryBufferHandle {
   base::SharedMemoryHandle handle;
 #if defined(OS_ANDROID)
   EGLClientBuffer native_buffer;
+  unsigned int texture_id;

[reveman, 2014/02/26 08:02:34]

I think it should be possible to create the surfacetexture with a bogus
texture-id and then bind it to a gpu service provided id in
GLImage::BindTexImage. That would be much preferred as it's how GLImage work on
all other platforms. Only problem with that is that the surface texture takes
ownership of the texture-id when bound and will delete it but this might still
be easier to work with than using a different texture-id for
GLImageSurfaceTexture.

+  void* surface_texture_handle;

[reveman, 2014/02/26 08:02:34]

hm, this should instead be something that can be serialized.

 #endif
 #if defined(OS_MACOSX)
   uint32 io_surface_id;